diff --git a/.cache/.gitkeep b/.cache/.gitkeep
new file mode 100644
index 0000000000000..e69de29bb2d1d
diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index 8be66683d48ab..6282631bfff2e 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -40,118 +40,35 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
   cancel-in-progress: true
 
+# Disable permissions for all available scopes by default.
+# Any needed permissions should be configured at the job level.
+permissions: {}
+
 jobs:
   # Runs PHP coding standards checks.
-  #
-  # Violations are reported inline with annotations.
-  #
-  # Performs the following steps:
-  # - Checks out the repository.
-  # - Sets up PHP.
-  # - Logs debug information.
-  # - Installs Composer dependencies (use cache if possible).
-  # - Make Composer packages available globally.
-  # - Logs PHP_CodeSniffer debug information.
-  # - Runs PHPCS on the full codebase with warnings suppressed.
-  # - Runs PHPCS on the `tests` directory without warnings suppressed.
-  # - Ensures version-controlled files are not modified or deleted.
-  # - todo: Configure Slack notifications for failing scans.
   phpcs:
     name: PHP coding standards
-    runs-on: ubuntu-latest
-    timeout-minutes: 20
+    uses: WordPress/wordpress-develop/.github/workflows/reusable-coding-standards-php.yml@trunk
+    permissions:
+      contents: read
     if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
-
-      - name: Set up PHP
-        uses: shivammathur/setup-php@d30ad8b1843ace22e6698ab99bbafaa747b6bd0d # v2.24.0
-        with:
-          php-version: '7.4'
-          coverage: none
-          tools: composer, cs2pr
-
-      - name: Log debug information
-        run: |
-          php --version
-          composer --version
-
-      - name: Install Composer dependencies
-        uses: ramsey/composer-install@83af392bf5f031813d25e6fe4cd626cdba9a2df6 # v2.2.0
-        with:
-          composer-options: "--no-progress --no-ansi"
-
-      - name: Make Composer packages available globally
-        run: echo "${PWD}/vendor/bin" >> $GITHUB_PATH
-
-      - name: Log PHPCS debug information
-        run: phpcs -i
-
-      - name: Run PHPCS on all Core files
-        run: phpcs -q -n --report=checkstyle | cs2pr
-
-      - name: Check test suite files for warnings
-        run: phpcs tests -q --report=checkstyle | cs2pr
-
-      - name: Ensure version-controlled files are not modified during the tests
-        run: git diff --exit-code
+    with:
+      php-version: '7.4'
 
   # Runs the JavaScript coding standards checks.
-  #
-  # JSHint violations are not currently reported inline with annotations.
-  #
-  # Performs the following steps:
-  # - Checks out the repository.
-  # - Logs debug information about the GitHub Action runner.
-  # - Installs Node.js.
-  # - Logs updated debug information.
-  # _ Installs npm dependencies.
-  # - Run the WordPress JSHint checks.
-  # - Ensures version-controlled files are not modified or deleted.
   jshint:
     name: JavaScript coding standards
-    runs-on: ubuntu-latest
-    timeout-minutes: 20
+    uses: WordPress/wordpress-develop/.github/workflows/reusable-coding-standards-javascript.yml@trunk
+    permissions:
+      contents: read
     if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}
-    env:
-      PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: ${{ true }}
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
-
-      - name: Log debug information
-        run: |
-          npm --version
-          node --version
-          git --version
-          svn --version
-
-      - name: Install Node.js
-        uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3.6.0
-        with:
-          node-version-file: '.nvmrc'
-          cache: npm
-
-      - name: Log debug information
-        run: |
-          npm --version
-          node --version
-
-      - name: Install Dependencies
-        run: npm ci
-
-      - name: Run JSHint
-        run: npm run grunt jshint
-
-      - name: Ensure version-controlled files are not modified or deleted
-        run: git diff --exit-code
 
   slack-notifications:
     name: Slack Notifications
     uses: WordPress/wordpress-develop/.github/workflows/slack-notifications.yml@trunk
+    permissions:
+      actions: read
+      contents: read
     needs: [ phpcs, jshint ]
     if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name != 'pull_request' && always() }}
     with:
@@ -165,6 +82,8 @@ jobs:
   failed-workflow:
     name: Failed workflow tasks
     runs-on: ubuntu-latest
+    permissions:
+      actions: write
     needs: [ phpcs, jshint, slack-notifications ]
     if: |
       always() &&
@@ -175,10 +94,9 @@ jobs:
         needs.phpcs.result == 'cancelled' || needs.phpcs.result == 'failure' ||
         needs.jshint.result == 'cancelled' || needs.jshint.result == 'failure'
       )
-
     steps:
       - name: Dispatch workflow run
-        uses: actions/github-script@98814c53be79b1d30f795b907e553d8679345975 # v6.4.0
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           retries: 2
           retry-exempt-status-codes: 418
diff --git a/.github/workflows/end-to-end-tests.yml b/.github/workflows/end-to-end-tests.yml
index 9534c5fb62322..dec8310dce247 100644
--- a/.github/workflows/end-to-end-tests.yml
+++ b/.github/workflows/end-to-end-tests.yml
@@ -26,115 +26,36 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
   cancel-in-progress: true
 
+# Disable permissions for all available scopes by default.
+# Any needed permissions should be configured at the job level.
+permissions: {}
+
 env:
   LOCAL_DIR: build
 
 jobs:
   # Runs the end-to-end test suite.
-  #
-  # Performs the following steps:
-  # - Sets environment variables.
-  # - Checks out the repository.
-  # - Logs debug information about the GitHub Action runner.
-  # - Installs Node.js.
-  # _ Installs npm dependencies.
-  # - Builds WordPress to run from the `build` directory.
-  # - Starts the WordPress Docker container.
-  # - Logs general debug information.
-  # - Logs the running Docker containers.
-  # - Logs Docker debug information (about both the Docker installation within the runner and the WordPress container).
-  # - Install WordPress within the Docker container.
-  # - Run the E2E tests.
-  # - Ensures version-controlled files are not modified or deleted.
   e2e-tests:
-    name: E2E Tests
-    runs-on: ubuntu-latest
-    timeout-minutes: 20
+    name: Test with SCRIPT_DEBUG ${{ matrix.LOCAL_SCRIPT_DEBUG && 'enabled' || 'disabled' }}
+    uses: WordPress/wordpress-develop/.github/workflows/reusable-end-to-end-tests.yml@trunk
+    permissions:
+      contents: read
     if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}
-
-    steps:
-      - name: Configure environment variables
-        run: |
-          echo "PHP_FPM_UID=$(id -u)" >> $GITHUB_ENV
-          echo "PHP_FPM_GID=$(id -g)" >> $GITHUB_ENV
-
-      - name: Checkout repository
-        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
-
-      - name: Log debug information
-        run: |
-          npm --version
-          node --version
-          curl --version
-          git --version
-          svn --version
-          php --version
-          php -i
-          locale -a
-
-      - name: Install Node.js
-        uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3.6.0
-        with:
-          node-version-file: '.nvmrc'
-          cache: npm
-
-      - name: Install Dependencies
-        run: npm ci
-
-      - name: Build WordPress
-        run: npm run build
-
-      - name: Start Docker environment
-        run: |
-          npm run env:start
-
-      - name: General debug information
-        run: |
-          npm --version
-          node --version
-          curl --version
-          git --version
-          svn --version
-
-      - name: Log running Docker containers
-        run: docker ps -a
-
-      - name: Docker debug information
-        run: |
-          docker -v
-          docker-compose -v
-          docker-compose run --rm mysql mysql --version
-          docker-compose run --rm php php --version
-          docker-compose run --rm php php -m
-          docker-compose run --rm php php -i
-          docker-compose run --rm php locale -a
-
-      - name: Install WordPress
-        run: npm run env:install
-
-      - name: Run E2E tests
-        run: npm run test:e2e
-
-      - name: Ensure version-controlled files are not modified or deleted
-        run: git diff --exit-code
-
-  slack-notifications:
-    name: Slack Notifications
-    uses: WordPress/wordpress-develop/.github/workflows/slack-notifications.yml@trunk
-    needs: [ e2e-tests ]
-    if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name != 'pull_request' && always() }}
+    strategy:
+      fail-fast: false
+      matrix:
+        LOCAL_SCRIPT_DEBUG: [ true, false ]
     with:
-      calling_status: ${{ needs.e2e-tests.result == 'success' && 'success' || needs.e2e-tests.result == 'cancelled' && 'cancelled' || 'failure' }}
-    secrets:
-      SLACK_GHA_SUCCESS_WEBHOOK: ${{ secrets.SLACK_GHA_SUCCESS_WEBHOOK }}
-      SLACK_GHA_CANCELLED_WEBHOOK: ${{ secrets.SLACK_GHA_CANCELLED_WEBHOOK }}
-      SLACK_GHA_FIXED_WEBHOOK: ${{ secrets.SLACK_GHA_FIXED_WEBHOOK }}
-      SLACK_GHA_FAILURE_WEBHOOK: ${{ secrets.SLACK_GHA_FAILURE_WEBHOOK }}
+      LOCAL_SCRIPT_DEBUG: ${{ matrix.LOCAL_SCRIPT_DEBUG }}
+      php-version: '8.0'
+      install-gutenberg: false
 
   failed-workflow:
     name: Failed workflow tasks
     runs-on: ubuntu-latest
-    needs: [ e2e-tests, slack-notifications ]
+    permissions:
+      actions: write
+    needs: [ e2e-tests ]
     if: |
       always() &&
       github.repository == 'WordPress/wordpress-develop' &&
@@ -143,10 +64,9 @@ jobs:
       (
         needs.e2e-tests.result == 'cancelled' || needs.e2e-tests.result == 'failure'
       )
-
     steps:
       - name: Dispatch workflow run
-        uses: actions/github-script@98814c53be79b1d30f795b907e553d8679345975 # v6.4.0
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           retries: 2
           retry-exempt-status-codes: 418
diff --git a/.github/workflows/javascript-tests.yml b/.github/workflows/javascript-tests.yml
index 808c152c9406a..6eec2ac604fb4 100644
--- a/.github/workflows/javascript-tests.yml
+++ b/.github/workflows/javascript-tests.yml
@@ -38,61 +38,29 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
   cancel-in-progress: true
 
+# Disable permissions for all available scopes by default.
+# Any needed permissions should be configured at the job level.
+permissions: {}
+
 jobs:
-  # Runs the QUnit tests for WordPress.
-  #
-  # Performs the following steps:
-  # - Checks out the repository.
-  # - Logs debug information about the GitHub Action runner.
-  # - Installs Node.js.
-  # - Logs updated debug information.
-  # _ Installs npm dependencies.
-  # - Run the WordPress QUnit tests.
-  # - Ensures version-controlled files are not modified or deleted.
+  # Runs the WordPress Core JavaScript tests.
   test-js:
     name: QUnit Tests
-    runs-on: ubuntu-latest
-    timeout-minutes: 20
+    uses: WordPress/wordpress-develop/.github/workflows/reusable-javascript-tests.yml@trunk
+    permissions:
+      contents: read
     if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}
 
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
-
-      - name: Log debug information
-        run: |
-          npm --version
-          node --version
-          git --version
-          svn --version
-
-      - name: Install Node.js
-        uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3.6.0
-        with:
-          node-version-file: '.nvmrc'
-          cache: npm
-
-      - name: Log debug information
-        run: |
-          npm --version
-          node --version
-
-      - name: Install Dependencies
-        run: npm ci
-
-      - name: Run QUnit tests
-        run: npm run grunt qunit:compiled
-
-      - name: Ensure version-controlled files are not modified or deleted
-        run: git diff --exit-code
-
   slack-notifications:
     name: Slack Notifications
     uses: WordPress/wordpress-develop/.github/workflows/slack-notifications.yml@trunk
+    permissions:
+      actions: read
+      contents: read
     needs: [ test-js ]
     if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name != 'pull_request' && always() }}
     with:
-      calling_status: ${{ needs.test-js.result == 'success' && 'success' || needs.test-js.result == 'cancelled' && 'cancelled' || 'failure' }}
+      calling_status: ${{ contains( needs.*.result, 'cancelled' ) && 'cancelled' || contains( needs.*.result, 'failure' ) && 'failure' || 'success' }}
     secrets:
       SLACK_GHA_SUCCESS_WEBHOOK: ${{ secrets.SLACK_GHA_SUCCESS_WEBHOOK }}
       SLACK_GHA_CANCELLED_WEBHOOK: ${{ secrets.SLACK_GHA_CANCELLED_WEBHOOK }}
@@ -102,19 +70,22 @@ jobs:
   failed-workflow:
     name: Failed workflow tasks
     runs-on: ubuntu-latest
-    needs: [ test-js, slack-notifications ]
+    permissions:
+      actions: write
+    needs: [ slack-notifications ]
     if: |
       always() &&
       github.repository == 'WordPress/wordpress-develop' &&
       github.event_name != 'pull_request' &&
       github.run_attempt < 2 &&
       (
-        needs.test-js.result == 'cancelled' || needs.test-js.result == 'failure'
+        contains( needs.*.result, 'cancelled' ) ||
+        contains( needs.*.result, 'failure' )
       )
 
     steps:
       - name: Dispatch workflow run
-        uses: actions/github-script@98814c53be79b1d30f795b907e553d8679345975 # v6.4.0
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           retries: 2
           retry-exempt-status-codes: 418
diff --git a/.github/workflows/php-compatibility.yml b/.github/workflows/php-compatibility.yml
index e646b96558074..6f9354118a4ef 100644
--- a/.github/workflows/php-compatibility.yml
+++ b/.github/workflows/php-compatibility.yml
@@ -22,7 +22,7 @@ on:
       - '**.php'
       # These files configure Composer. Changes could affect the outcome.
       - 'composer.*'
-      # This file configures PHP Compatibility scanning. Changes could affect the outcome.
+      # This file configures PHP compatibility scanning. Changes could affect the outcome.
       - 'phpcompat.xml.dist'
       # Changes to workflow files should always verify all workflows are successful.
       - '.github/workflows/*.yml'
@@ -35,76 +35,27 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
   cancel-in-progress: true
 
-jobs:
+# Disable permissions for all available scopes by default.
+# Any needed permissions should be configured at the job level.
+permissions: {}
 
+jobs:
   # Runs PHP compatibility testing.
-  #
-  # Violations are reported inline with annotations.
-  #
-  # Performs the following steps:
-  # - Checks out the repository.
-  # - Sets up PHP.
-  # - Logs debug information about the GitHub Action runner.
-  # - Installs Composer dependencies (use cache if possible).
-  # - Make Composer packages available globally.
-  # - Logs PHP_CodeSniffer debug information.
-  # - Runs the PHP compatibility tests.
-  # - Ensures version-controlled files are not modified or deleted.
-  # - todo: Configure Slack notifications for failing scans.
   php-compatibility:
     name: Check PHP compatibility
-    runs-on: ubuntu-latest
-    timeout-minutes: 20
+    uses: WordPress/wordpress-develop/.github/workflows/reusable-php-compatibility.yml@trunk
+    permissions:
+      contents: read
     if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
-
-      - name: Set up PHP
-        uses: shivammathur/setup-php@d30ad8b1843ace22e6698ab99bbafaa747b6bd0d # v2.24.0
-        with:
-          php-version: '7.4'
-          coverage: none
-          tools: composer, cs2pr
-
-      - name: Log debug information
-        run: |
-          php --version
-          composer --version
-
-      # This date is used to ensure that the PHP compatibility cache is cleared at least once every week.
-      # http://man7.org/linux/man-pages/man1/date.1.html
-      - name: "Get last Monday's date"
-        id: get-date
-        run: echo "date=$(/bin/date -u --date='last Mon' "+%F")" >> $GITHUB_OUTPUT
-
-      - name: Cache PHP compatibility scan cache
-        uses: actions/cache@69d9d449aced6a2ede0bc19182fadc3a0a42d2b0 # v3.2.6
-        with:
-          path: .cache/phpcompat.json
-          key: ${{ runner.os }}-date-${{ steps.get-date.outputs.date }}-phpcompat-cache-${{ hashFiles('**/composer.json', 'phpcompat.xml.dist') }}
-
-      - name: Install Composer dependencies
-        uses: ramsey/composer-install@83af392bf5f031813d25e6fe4cd626cdba9a2df6 # v2.2.0
-        with:
-          composer-options: "--no-progress --no-ansi"
-
-      - name: Make Composer packages available globally
-        run: echo "${PWD}/vendor/bin" >> $GITHUB_PATH
-
-      - name: Log PHPCS debug information
-        run: phpcs -i
-
-      - name: Run PHP compatibility tests
-        run: phpcs --standard=phpcompat.xml.dist -q --report=checkstyle | cs2pr
-
-      - name: Ensure version-controlled files are not modified or deleted
-        run: git diff --exit-code
+    with:
+      php-version: '7.4'
 
   slack-notifications:
     name: Slack Notifications
     uses: WordPress/wordpress-develop/.github/workflows/slack-notifications.yml@trunk
+    permissions:
+      actions: read
+      contents: read
     needs: [ php-compatibility ]
     if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name != 'pull_request' && always() }}
     with:
@@ -118,6 +69,8 @@ jobs:
   failed-workflow:
     name: Failed workflow tasks
     runs-on: ubuntu-latest
+    permissions:
+      actions: write
     needs: [ php-compatibility, slack-notifications ]
     if: |
       always() &&
@@ -130,7 +83,7 @@ jobs:
 
     steps:
       - name: Dispatch workflow run
-        uses: actions/github-script@98814c53be79b1d30f795b907e553d8679345975 # v6.4.0
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           retries: 2
           retry-exempt-status-codes: 418
diff --git a/.github/workflows/phpunit-tests.yml b/.github/workflows/phpunit-tests.yml
index 305e741df67f1..143785d2d948f 100644
--- a/.github/workflows/phpunit-tests.yml
+++ b/.github/workflows/phpunit-tests.yml
@@ -26,49 +26,27 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
   cancel-in-progress: true
 
-env:
-  PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: ${{ true }}
-  # Controls which npm script to use for running PHPUnit tests. Options ar `php` and `php-composer`.
-  PHPUNIT_SCRIPT: php
-  LOCAL_PHP_MEMCACHED: ${{ false }}
-  SLOW_TESTS: 'external-http,media,restapi'
+# Disable permissions for all available scopes by default.
+# Any needed permissions should be configured at the job level.
+permissions: {}
 
 jobs:
-  # Runs the PHPUnit tests for WordPress.
-  #
-  # Performs the following steps:
-  # - Sets environment variables.
-  # - Sets up the environment variables needed for testing with memcached (if desired).
-  # - Installs Node.js.
-  # - Installs npm dependencies
-  # - Configures caching for Composer.
-  # - Installs Composer dependencies.
-  # - Logs Docker debug information (about the Docker installation within the runner).
-  # - Starts the WordPress Docker container.
-  # - Starts the Memcached server after the Docker network has been created (if desired).
-  # - Logs general debug information about the runner.
-  # - Logs the running Docker containers.
-  # - Logs debug information from inside the WordPress Docker container.
-  # - Logs debug information about what's installed within the WordPress Docker containers.
-  # - Install WordPress within the Docker container.
-  # - Run the PHPUnit tests.
-  # - Ensures version-controlled files are not modified or deleted.
-  # - Checks out the WordPress Test reporter repository.
-  # - Reconnect the directory to the Git repository.
-  # - Submit the test results to the WordPress.org host test results.
+  # Creates PHPUnit test jobs.
   test-php:
-    name: ${{ matrix.php }}${{ matrix.multisite && ' multisite' || '' }}${{ matrix.split_slow && ' slow tests' || '' }}${{ matrix.memcached && ' with memcached' || '' }} on ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-    timeout-minutes: 20
+    name: PHP ${{ matrix.php }}
+    uses: desrosj/wordpress-develop/.github/workflows/reusable-phpunit-tests-v2.yml@improve/reusable-workflows-for-old-branches
+    permissions:
+      contents: read
+    secrets: inherit
     if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}
     strategy:
       fail-fast: false
       matrix:
-        php: [ '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0' ]
         os: [ ubuntu-latest ]
-        memcached: [ false ]
-        split_slow: [ false ]
+        php: [ '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0' ]
         multisite: [ false, true ]
+        split_slow: [ false ]
+        memcached: [ false ]
         include:
           # Additional "slow" jobs for PHP 5.6.
           - php: '5.6'
@@ -96,155 +74,25 @@ jobs:
             memcached: false
             multisite: false
             report: true
-    env:
-      LOCAL_PHP: ${{ matrix.php }}-fpm
-      LOCAL_PHP_MEMCACHED: ${{ matrix.memcached }}
-      PHPUNIT_CONFIG: ${{ matrix.multisite && 'tests/phpunit/multisite.xml' || 'phpunit.xml.dist' }}
-
-    steps:
-      - name: Configure environment variables
-        run: |
-          echo "PHP_FPM_UID=$(id -u)" >> $GITHUB_ENV
-          echo "PHP_FPM_GID=$(id -g)" >> $GITHUB_ENV
-
-      - name: Checkout repository
-        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
-
-      - name: Install Node.js
-        uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3.6.0
-        with:
-          node-version-file: '.nvmrc'
-          cache: npm
-
-      - name: Install npm dependencies
-        run: npm ci
-
-      - name: Get composer cache directory
-        id: composer-cache
-        run: echo "composer_dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
-
-      - name: Cache Composer dependencies
-        uses: actions/cache@9b0c1fce7a93df8e3bb8926b0d6e9d89e92f20a7 # v3.0.11
-        env:
-          cache-name: cache-composer-dependencies
-        with:
-          path: ${{ steps.composer-cache.outputs.composer_dir }}
-          key: ${{ runner.os }}-php-${{ matrix.php }}-composer-${{ hashFiles('**/composer.lock') }}
-
-      - name: Install Composer dependencies
-        run: |
-          docker-compose run --rm php composer --version
-
-          # The PHPUnit 7.x phar is not compatible with PHP 8 and won't be updated,
-          # as PHPUnit 7 is no longer supported. The Composer-installed PHPUnit should be
-          # used for PHP 8 testing instead.
-          if [ ${{ env.LOCAL_PHP }} == '8.0-fpm' ]; then
-            docker-compose run --rm php composer install --ignore-platform-reqs
-            echo "PHPUNIT_SCRIPT=php-composer" >> $GITHUB_ENV
-          elif [ ${{ env.LOCAL_PHP }} == '7.1-fpm' ]; then
-            docker-compose run --rm php composer update
-            git checkout -- composer.lock
-          elif [[ ${{ env.LOCAL_PHP }} == '5.6-fpm' || ${{ env.LOCAL_PHP }} == '7.0-fpm' ]]; then
-            docker-compose run --rm php composer require --dev phpunit/phpunit:"^5.7" --update-with-dependencies
-            git checkout -- composer.lock composer.json
-          else
-            docker-compose run --rm php composer install
-          fi
-
-      - name: Docker debug information
-        run: |
-          docker -v
-          docker-compose -v
-
-      - name: Start Docker environment
-        run: |
-          npm run env:start
-
-      # The memcached server needs to start after the Docker network has been set up with `npm run env:start`.
-      - name: Start the Memcached server.
-        if: ${{ matrix.memcached }}
-        run: |
-          cp tests/phpunit/includes/object-cache.php src/wp-content/object-cache.php
-          docker run --name memcached --net $(basename "$PWD")_wpdevnet -d memcached
-
-      - name: General debug information
-        run: |
-          npm --version
-          node --version
-          curl --version
-          git --version
-          svn --version
-
-      - name: Log running Docker containers
-        run: docker ps -a
-
-      - name: WordPress Docker container debug information
-        run: |
-          docker-compose run --rm mysql mysql --version
-          docker-compose run --rm php php --version
-          docker-compose run --rm php php -m
-          docker-compose run --rm php php -i
-          docker-compose run --rm php locale -a
-
-      - name: Install WordPress
-        run: npm run env:install
-
-      - name: Run slow PHPUnit tests
-        if: ${{ matrix.split_slow }}
-        run: npm run test:${{ env.PHPUNIT_SCRIPT }} -- --verbose -c ${{ env.PHPUNIT_CONFIG }} --group ${{ env.SLOW_TESTS }}
-
-      - name: Run PHPUnit tests for single site excluding slow tests
-        if: ${{ matrix.php < '7.0' && ! matrix.split_slow && ! matrix.multisite }}
-        run: npm run test:${{ env.PHPUNIT_SCRIPT }} -- --verbose -c ${{ env.PHPUNIT_CONFIG }} --exclude-group ${{ env.SLOW_TESTS }},ajax,ms-files,ms-required
-
-      - name: Run PHPUnit tests for Multisite excluding slow tests
-        if: ${{ matrix.php < '7.0' && ! matrix.split_slow && matrix.multisite }}
-        run: npm run test:${{ env.PHPUNIT_SCRIPT }} -- --verbose -c ${{ env.PHPUNIT_CONFIG }} --exclude-group ${{ env.SLOW_TESTS }},ajax,ms-files,ms-excluded,oembed-headers
-
-      - name: Run PHPUnit tests
-        if: ${{ matrix.php >= '7.0' }}
-        run: npm run test:${{ env.PHPUNIT_SCRIPT }} -- --verbose -c ${{ env.PHPUNIT_CONFIG }}
-
-      - name: Run AJAX tests
-        if: ${{ ! matrix.split_slow }}
-        run: npm run test:${{ env.PHPUNIT_SCRIPT }} -- --verbose -c ${{ env.PHPUNIT_CONFIG }} --group ajax
-
-      - name: Run ms-files tests as a multisite install
-        if: ${{ matrix.multisite && ! matrix.split_slow }}
-        run: npm run test:${{ env.PHPUNIT_SCRIPT }} -- --verbose -c tests/phpunit/multisite.xml --group ms-files
-
-      - name: Run external HTTP tests
-        if: ${{ ! matrix.multisite && ! matrix.split_slow }}
-        run: npm run test:${{ env.PHPUNIT_SCRIPT }} -- --verbose -c phpunit.xml.dist --group external-http
-
-      # __fakegroup__ is excluded to force PHPUnit to ignore the <exclude> settings in phpunit.xml.dist.
-      - name: Run (xDebug) tests
-        if: ${{ ! matrix.split_slow }}
-        run: LOCAL_PHP_XDEBUG=true npm run test:${{ env.PHPUNIT_SCRIPT }} -- -v --group xdebug --exclude-group __fakegroup__
-
-      - name: Ensure version-controlled files are not modified or deleted
-        run: git diff --exit-code
-
-      - name: Checkout the WordPress Test Reporter
-        if: ${{ github.repository == 'WordPress/wordpress-develop' && github.ref == 'refs/heads/trunk' && matrix.report }}
-        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
-        with:
-          repository: 'WordPress/phpunit-test-runner'
-          path: 'test-runner'
-
-      - name: Submit test results to the WordPress.org host test results
-        if: ${{ github.repository == 'WordPress/wordpress-develop' && github.ref == 'refs/heads/trunk' && matrix.report }}
-        env:
-          WPT_REPORT_API_KEY: "${{ secrets.WPT_REPORT_API_KEY }}"
-        run: docker-compose run --rm -e WPT_REPORT_API_KEY -e WPT_PREPARE_DIR=/var/www -e WPT_TEST_DIR=/var/www php php test-runner/report.php
+    with:
+      os: ${{ matrix.os }}
+      php: ${{ matrix.php }}
+      multisite: ${{ matrix.multisite }}
+      split_slow: ${{ matrix.split_slow }}
+      memcached: ${{ matrix.memcached }}
+      phpunit-config: ${{ matrix.multisite && 'tests/phpunit/multisite.xml' || 'phpunit.xml.dist' }}
+      report: ${{ matrix.report || false }}
 
   slack-notifications:
     name: Slack Notifications
     uses: WordPress/wordpress-develop/.github/workflows/slack-notifications.yml@trunk
+    permissions:
+      actions: read
+      contents: read
     needs: [ test-php ]
     if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name != 'pull_request' && always() }}
     with:
-      calling_status: ${{ needs.test-php.result == 'success' && 'success' || needs.test-php.result == 'cancelled' && 'cancelled' || 'failure' }}
+      calling_status: ${{ contains( needs.*.result, 'cancelled' ) && 'cancelled' || contains( needs.*.result, 'failure' ) && 'failure' || 'success' }}
     secrets:
       SLACK_GHA_SUCCESS_WEBHOOK: ${{ secrets.SLACK_GHA_SUCCESS_WEBHOOK }}
       SLACK_GHA_CANCELLED_WEBHOOK: ${{ secrets.SLACK_GHA_CANCELLED_WEBHOOK }}
@@ -254,19 +102,22 @@ jobs:
   failed-workflow:
     name: Failed workflow tasks
     runs-on: ubuntu-latest
-    needs: [ test-php, slack-notifications ]
+    permissions:
+      actions: write
+    needs: [ slack-notifications ]
     if: |
       always() &&
       github.repository == 'WordPress/wordpress-develop' &&
       github.event_name != 'pull_request' &&
       github.run_attempt < 2 &&
       (
-        needs.test-php.result == 'cancelled' || needs.test-php.result == 'failure'
+        contains( needs.*.result, 'cancelled' ) ||
+        contains( needs.*.result, 'failure' )
       )
 
     steps:
       - name: Dispatch workflow run
-        uses: actions/github-script@98814c53be79b1d30f795b907e553d8679345975 # v6.4.0
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           retries: 2
           retry-exempt-status-codes: 418
diff --git a/.github/workflows/test-build-processes.yml b/.github/workflows/test-build-processes.yml
new file mode 100644
index 0000000000000..8b3c8e50be2f4
--- /dev/null
+++ b/.github/workflows/test-build-processes.yml
@@ -0,0 +1,135 @@
+name: Test Build Processes
+
+on:
+  push:
+    branches:
+      - trunk
+      - '3.[7-9]'
+      - '[4-9].[0-9]'
+    tags:
+      - '[0-9]+.[0-9]'
+      - '[0-9]+.[0-9].[0-9]+'
+  pull_request:
+    branches:
+      - trunk
+      - '3.[7-9]'
+      - '[4-9].[0-9]'
+    paths:
+      # These files configure npm. Changes could affect the outcome.
+      - 'package*.json'
+      # JavaScript files are built using npm.
+      - '**.js'
+      # CSS and SCSS files are built using npm.
+      - '**.scss'
+      - '**.css'
+      # Changes to workflow files should always verify all workflows are successful.
+      - '.github/workflows/**.yml'
+  workflow_dispatch:
+
+# Cancels all previous workflow runs for pull requests that have not completed.
+concurrency:
+  # The concurrency group contains the workflow name and the branch name for pull requests
+  # or the commit hash for any other events.
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
+  cancel-in-progress: true
+
+# Disable permissions for all available scopes by default.
+# Any needed permissions should be configured at the job level.
+permissions: {}
+
+jobs:
+  # Tests the WordPress Core build process on multiple operating systems.
+  test-core-build-process:
+    name: Core running from ${{ matrix.directory }}
+    uses: WordPress/wordpress-develop/.github/workflows/reusable-test-core-build-process.yml@trunk
+    permissions:
+      contents: read
+    if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ ubuntu-latest, windows-latest ]
+        directory: [ 'src', 'build' ]
+        include:
+          # Only prepare artifacts once.
+          - os: ubuntu-latest
+            directory: 'build'
+            prepare-playground: true
+    with:
+      os: ${{ matrix.os }}
+      directory: ${{ matrix.directory }}
+      prepare-playground: ${{ matrix.prepare-playground && matrix.prepare-playground || false }}
+      test-emoji: false
+
+  # Tests the WordPress Core build process on MacOS.
+  #
+  # This is separate from the job above in order to use stricter conditions when determining when to run.
+  # This avoids unintentionally consuming excessive minutes, as MacOS jobs consume minutes at a 10x rate.
+  #
+  # The `matrix` and `runner` contexts are not available for use within `if` expressions. So there is
+  # currently no way to determine the OS being used on a given job.
+  # See https://docs.github.com/en/actions/learn-github-actions/contexts#context-availability.
+  test-core-build-process-macos:
+    name: Core running from ${{ matrix.directory }}
+    uses: WordPress/wordpress-develop/.github/workflows/reusable-test-core-build-process.yml@trunk
+    permissions:
+      contents: read
+    if: ${{ github.repository == 'WordPress/wordpress-develop' }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ macos-13 ]
+        directory: [ 'src', 'build' ]
+    with:
+      os: ${{ matrix.os }}
+      directory: ${{ matrix.directory }}
+      test-emoji: false
+
+  slack-notifications:
+    name: Slack Notifications
+    uses: WordPress/wordpress-develop/.github/workflows/slack-notifications.yml@trunk
+    permissions:
+      actions: read
+      contents: read
+    needs: [ test-core-build-process, test-core-build-process-macos ]
+    if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name != 'pull_request' && always() }}
+    with:
+      calling_status: ${{ contains( needs.*.result, 'cancelled' ) && 'cancelled' || contains( needs.*.result, 'failure' ) && 'failure' || 'success' }}
+    secrets:
+      SLACK_GHA_SUCCESS_WEBHOOK: ${{ secrets.SLACK_GHA_SUCCESS_WEBHOOK }}
+      SLACK_GHA_CANCELLED_WEBHOOK: ${{ secrets.SLACK_GHA_CANCELLED_WEBHOOK }}
+      SLACK_GHA_FIXED_WEBHOOK: ${{ secrets.SLACK_GHA_FIXED_WEBHOOK }}
+      SLACK_GHA_FAILURE_WEBHOOK: ${{ secrets.SLACK_GHA_FAILURE_WEBHOOK }}
+
+  failed-workflow:
+    name: Failed workflow tasks
+    runs-on: ubuntu-latest
+    permissions:
+      actions: write
+    needs: [ slack-notifications ]
+    if: |
+      always() &&
+      github.repository == 'WordPress/wordpress-develop' &&
+      github.event_name != 'pull_request' &&
+      github.run_attempt < 2 &&
+      (
+        contains( needs.*.result, 'cancelled' ) ||
+        contains( needs.*.result, 'failure' )
+      )
+
+    steps:
+      - name: Dispatch workflow run
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        with:
+          retries: 2
+          retry-exempt-status-codes: 418
+          script: |
+            github.rest.actions.createWorkflowDispatch({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              workflow_id: 'failed-workflow.yml',
+              ref: 'trunk',
+              inputs: {
+                run_id: '${{ github.run_id }}'
+              }
+            });
diff --git a/.github/workflows/test-npm.yml b/.github/workflows/test-npm.yml
deleted file mode 100644
index dc569a6315b79..0000000000000
--- a/.github/workflows/test-npm.yml
+++ /dev/null
@@ -1,199 +0,0 @@
-name: Test npm
-
-on:
-  push:
-    branches:
-      - trunk
-      - '3.[7-9]'
-      - '[4-9].[0-9]'
-    tags:
-      - '[0-9]+.[0-9]'
-      - '[0-9]+.[0-9].[0-9]+'
-  pull_request:
-    branches:
-      - trunk
-      - '3.[7-9]'
-      - '[4-9].[0-9]'
-    paths:
-      # These files configure npm. Changes could affect the outcome.
-      - 'package*.json'
-      # JavaScript files are built using npm.
-      - '**.js'
-      # CSS and SCSS files are built using npm.
-      - '**.scss'
-      - '**.css'
-      # Changes to workflow files should always verify all workflows are successful.
-      - '.github/workflows/**.yml'
-  workflow_dispatch:
-
-# Cancels all previous workflow runs for pull requests that have not completed.
-concurrency:
-  # The concurrency group contains the workflow name and the branch name for pull requests
-  # or the commit hash for any other events.
-  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
-  cancel-in-progress: true
-
-env:
-  PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: ${{ true }}
-
-jobs:
-  # Verifies that installing npm dependencies and building WordPress works as expected.
-  #
-  # Performs the following steps:
-  # - Checks out the repository.
-  # - Logs debug information about the GitHub Action runner.
-  # - Installs Node.js.
-  # _ Installs npm dependencies.
-  # - Builds WordPress to run from the `build` directory.
-  # - Cleans up after building WordPress to the `build` directory.
-  # - Ensures version-controlled files are not modified or deleted.
-  # - Builds WordPress to run from the `src` directory.
-  # - Cleans up after building WordPress to the `src` directory.
-  # - Ensures version-controlled files are not modified or deleted.
-  test-npm:
-    name: Test npm on ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-    timeout-minutes: 20
-    if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ ubuntu-latest, windows-latest ]
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
-
-      - name: Log debug information
-        run: |
-          npm --version
-          node --version
-          curl --version
-          git --version
-          svn --version
-
-      - name: Install Node.js
-        uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3.6.0
-        with:
-          node-version-file: '.nvmrc'
-          cache: npm
-
-      - name: Install Dependencies
-        run: npm ci
-
-      - name: Build WordPress
-        run: npm run build
-
-      - name: Clean after building
-        run: npm run grunt clean
-
-      - name: Ensure version-controlled files are not modified or deleted during building and cleaning
-        run: git diff --exit-code
-
-  # Verifies that installing npm dependencies and building WordPress works as expected on MacOS.
-  #
-  # This is separate from the job above in order to use stricter conditions about when to run.
-  # This avoids unintentionally consuming excessive minutes, as MacOS jobs consume minutes at a 10x rate.
-  #
-  # The `matrix` and `runner` contexts are not available for use within `if` expressions. So there is
-  # currently no way to determine the OS being used on a given job.
-  # See https://docs.github.com/en/actions/learn-github-actions/contexts#context-availability.
-  #
-  # Performs the following steps:
-  # - Checks out the repository.
-  # - Logs debug information about the GitHub Action runner.
-  # - Installs Node.js.
-  # _ Installs npm dependencies.
-  # - Builds WordPress to run from the `build` directory.
-  # - Cleans up after building WordPress to the `build` directory.
-  # - Ensures version-controlled files are not modified or deleted.
-  # - Builds WordPress to run from the `src` directory.
-  # - Cleans up after building WordPress to the `src` directory.
-  # - Ensures version-controlled files are not modified or deleted.
-  test-npm-macos:
-    name: Test npm on MacOS
-    runs-on: macos-latest
-    timeout-minutes: 30
-    if: ${{ github.repository == 'WordPress/wordpress-develop' }}
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
-
-      - name: Log debug information
-        run: |
-          npm --version
-          node --version
-          curl --version
-          git --version
-          svn --version
-
-      - name: Install Node.js
-        uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3.6.0
-        with:
-          node-version-file: '.nvmrc'
-          cache: npm
-
-      - name: Install Dependencies
-        run: npm ci
-
-      - name: Build WordPress
-        run: npm run build
-
-      - name: Clean after building
-        run: npm run grunt clean
-
-      - name: Ensure version-controlled files are not modified or deleted during building and cleaning
-        run: git diff --exit-code
-
-      - name: Build WordPress in /src
-        run: npm run build:dev
-
-      - name: Clean after building in /src
-        run: npm run grunt clean -- --dev
-
-      - name: Ensure version-controlled files are not modified or deleted during building and cleaning
-        run: git diff --exit-code
-
-  slack-notifications:
-    name: Slack Notifications
-    uses: WordPress/wordpress-develop/.github/workflows/slack-notifications.yml@trunk
-    needs: [ test-npm, test-npm-macos ]
-    if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name != 'pull_request' && always() }}
-    with:
-      calling_status: ${{ needs.test-npm.result == 'success' && needs.test-npm-macos.result == 'success' && 'success' || ( needs.test-npm.result == 'cancelled' || needs.test-npm-macos.result == 'cancelled' ) && 'cancelled' || 'failure' }}
-    secrets:
-      SLACK_GHA_SUCCESS_WEBHOOK: ${{ secrets.SLACK_GHA_SUCCESS_WEBHOOK }}
-      SLACK_GHA_CANCELLED_WEBHOOK: ${{ secrets.SLACK_GHA_CANCELLED_WEBHOOK }}
-      SLACK_GHA_FIXED_WEBHOOK: ${{ secrets.SLACK_GHA_FIXED_WEBHOOK }}
-      SLACK_GHA_FAILURE_WEBHOOK: ${{ secrets.SLACK_GHA_FAILURE_WEBHOOK }}
-
-  failed-workflow:
-    name: Failed workflow tasks
-    runs-on: ubuntu-latest
-    needs: [ test-npm, test-npm-macos, slack-notifications ]
-    if: |
-      always() &&
-      github.repository == 'WordPress/wordpress-develop' &&
-      github.event_name != 'pull_request' &&
-      github.run_attempt < 2 &&
-      (
-        needs.test-npm.result == 'cancelled' || needs.test-npm.result == 'failure' ||
-        needs.test-npm-macos.result == 'cancelled' || needs.test-npm-macos.result == 'failure'
-      )
-
-    steps:
-      - name: Dispatch workflow run
-        uses: actions/github-script@98814c53be79b1d30f795b907e553d8679345975 # v6.4.0
-        with:
-          retries: 2
-          retry-exempt-status-codes: 418
-          script: |
-            github.rest.actions.createWorkflowDispatch({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              workflow_id: 'failed-workflow.yml',
-              ref: 'trunk',
-              inputs: {
-                run_id: '${{ github.run_id }}'
-              }
-            });
diff --git a/.github/workflows/welcome-new-contributors.yml b/.github/workflows/welcome-new-contributors.yml
deleted file mode 100644
index 15457f65bd088..0000000000000
--- a/.github/workflows/welcome-new-contributors.yml
+++ /dev/null
@@ -1,59 +0,0 @@
-name: Welcome New Contributors
-
-on:
-  pull_request_target:
-    types: [ opened ]
-
-jobs:
-  # Comments on a pull request when the author is a new contributor.
-  post-welcome-message:
-    runs-on: ubuntu-latest
-    timeout-minutes: 5
-    if: ${{ github.repository == 'WordPress/wordpress-develop' }}
-
-    steps:
-      - uses: wow-actions/welcome@72817eb31cda1de60f51893d80e2e82ce57f7e76 # v1.3.0
-        with:
-          FIRST_PR_COMMENT: >
-            Hi @{{ author }}! 👋
-
-
-            Thank you for your contribution to WordPress! 💖
-
-
-            It looks like this is your first pull request to `wordpress-develop`. Here are a few things to be aware of that may help you out!
-
-
-            **No one monitors this repository for new pull requests.** Pull requests **must** be attached to a Trac ticket to be considered for inclusion in WordPress Core. To attach a pull request to a Trac ticket, please include the ticket's full URL in your pull request description.
-
-
-            **Pull requests are never merged on GitHub.** The WordPress codebase continues to be managed through the SVN repository that this GitHub repository mirrors. Please feel free to open pull requests to work on any contribution you are making.
-
-
-            More information about how GitHub pull requests can be used to contribute to WordPress can be found in [this blog post](https://make.wordpress.org/core/2020/02/21/working-on-trac-tickets-using-github-pull-requests/).
-
-
-            **Please include automated tests.** Including tests in your pull request is one way to help your patch be considered faster. To learn about WordPress' test suites, visit the [Automated Testing](https://make.wordpress.org/core/handbook/testing/automated-testing/) page in the handbook.
-
-
-            If you have not had a chance, please review the [Contribute with Code page](https://make.wordpress.org/core/handbook/contribute/) in the [WordPress Core Handbook](https://make.wordpress.org/core/handbook/).
-
-
-            The [Developer Hub](https://developer.wordpress.org/) also documents the various [coding standards](https://make.wordpress.org/core/handbook/best-practices/coding-standards/) that are followed:
-
-            - [PHP Coding Standards](https://developer.wordpress.org/coding-standards/wordpress-coding-standards/php/)
-
-            - [CSS Coding Standards](https://developer.wordpress.org/coding-standards/wordpress-coding-standards/css/)
-
-            - [HTML Coding Standards](https://developer.wordpress.org/coding-standards/wordpress-coding-standards/html/)
-
-            - [JavaScript Coding Standards](https://developer.wordpress.org/coding-standards/wordpress-coding-standards/javascript/)
-
-            - [Accessibility Coding Standards](https://developer.wordpress.org/coding-standards/wordpress-coding-standards/accessibility/)
-
-            - [Inline Documentation Standards](https://developer.wordpress.org/coding-standards/inline-documentation-standards/)
-
-
-            Thank you,
-
-            The WordPress Project
diff --git a/.gitignore b/.gitignore
index c635d8dc1d5d2..da388583088c6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,7 @@ wp-tests-config.php
 /phpunit.xml
 /.phpcs.xml
 /phpcs.xml
+*.cache/*
 /tests/phpunit/data/plugins/wordpress-importer
 /tests/phpunit/data/.trac-ticket-cache*
 /tests/qunit/compiled.html
diff --git a/docker-compose.yml b/docker-compose.yml
index 06fbfbbe13da0..e7f5fc51c490e 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,5 +1,3 @@
-version: '3.7'
-
 services:
 
   ##
@@ -25,7 +23,10 @@ services:
     command: /bin/sh -c "envsubst '$$LOCAL_DIR' < /etc/nginx/conf.d/default.template > /etc/nginx/conf.d/default.conf && exec nginx -g 'daemon off;'"
 
     depends_on:
-      - php
+      php:
+        condition: service_started
+      mysql:
+        condition: service_healthy
 
   ##
   # The PHP container.
@@ -38,6 +39,7 @@ services:
 
     environment:
       - LOCAL_PHP_XDEBUG=${LOCAL_PHP_XDEBUG-false}
+      - XDEBUG_MODE=${LOCAL_PHP_XDEBUG_MODE-develop,debug}
       - LOCAL_PHP_MEMCACHED=${LOCAL_PHP_MEMCACHED-false}
       - PHP_FPM_UID=${PHP_FPM_UID-1000}
       - PHP_FPM_GID=${PHP_FPM_GID-1000}
@@ -46,14 +48,21 @@ services:
       - ./tools/local-env/php-config.ini:/usr/local/etc/php/conf.d/php-config.ini
       - ./:/var/www
 
-    depends_on:
-      - mysql
+    # Copy or delete the Memcached dropin plugin file as appropriate.
+    command: /bin/sh -c "if [ $LOCAL_PHP_MEMCACHED = true ]; then cp -n /var/www/tests/phpunit/includes/object-cache.php /var/www/src/wp-content/object-cache.php; else rm -f /var/www/src/wp-content/object-cache.php; fi && exec php-fpm"
+
+    # The init directive ensures the command runs with a PID > 1, so Ctrl+C works correctly.
+    init: true
+
+    extra_hosts:
+      - localhost:host-gateway
 
   ##
   # The MySQL container.
   ##
   mysql:
-    image: amd64/${LOCAL_DB_TYPE-mysql}:${LOCAL_DB_VERSION-latest}
+    image: ${LOCAL_DB_TYPE-mysql}:${LOCAL_DB_VERSION-latest}
+    platform: linux/amd64
 
     networks:
       - wpdevnet
@@ -71,6 +80,12 @@ services:
     # For compatibility with PHP versions that don't support the caching_sha2_password auth plugin used in MySQL 8.0.
     command: --default-authentication-plugin=mysql_native_password
 
+    healthcheck:
+      test: [ "CMD-SHELL", "if [ \"$LOCAL_DB_TYPE\" = \"mariadb\" ]; then mariadb-admin ping -h localhost; else mysqladmin ping -h localhost; fi" ]
+      timeout: 5s
+      interval: 5s
+      retries: 10
+
   ##
   # The WP CLI container.
   ##
@@ -92,6 +107,15 @@ services:
     # The init directive ensures the command runs with a PID > 1, so Ctrl+C works correctly.
     init: true
 
+    extra_hosts:
+      - localhost:host-gateway
+
+    depends_on:
+      php:
+        condition: service_started
+      mysql:
+        condition: service_healthy
+
   ##
   # The PHPUnit container.
   ##
@@ -120,7 +144,26 @@ services:
     init: true
 
     depends_on:
-      - mysql
+      php:
+        condition: service_started
+      mysql:
+        condition: service_healthy
+
+  ##
+  # The Memcached container.
+  ##
+  memcached:
+    image: memcached
+
+    networks:
+      - wpdevnet
+
+    ports:
+      - 11211:11211
+
+    depends_on:
+      php:
+        condition: service_started
 
 volumes:
   # So that sites aren't wiped every time containers are restarted, MySQL uses a persistent volume.
diff --git a/phpcompat.xml.dist b/phpcompat.xml.dist
index 5af8e2a5039ae..47760305a9676 100644
--- a/phpcompat.xml.dist
+++ b/phpcompat.xml.dist
@@ -11,7 +11,7 @@
 	<arg name="extensions" value="php"/>
 
 	<!-- Whenever possible, cache the scan results and re-use those for unchanged files on the next scan. -->
-	<arg name="cache"/>
+	<arg name="cache" value=".cache/phpcompat.json"/>
 
 	<!-- Set the memory limit to 256M.
 		 For most standard PHP configurations, this means the memory limit will temporarily be raised.
diff --git a/phpcs.xml.dist b/phpcs.xml.dist
index d09abc947ce28..cad5532c53037 100644
--- a/phpcs.xml.dist
+++ b/phpcs.xml.dist
@@ -6,7 +6,7 @@
 	<arg name="extensions" value="php"/>
 
 	<!-- Whenever possible, cache the scan results and re-use those for unchanged files on the next scan. -->
-	<arg name="cache"/>
+	<arg name="cache" value=".cache/phpcs.json"/>
 
 	<!-- Set the memory limit to 256M.
 		 For most standard PHP configurations, this means the memory limit will temporarily be raised.
diff --git a/tools/local-env/scripts/docker.js b/tools/local-env/scripts/docker.js
index 60cb305b7f498..e4c382140a498 100644
--- a/tools/local-env/scripts/docker.js
+++ b/tools/local-env/scripts/docker.js
@@ -4,5 +4,5 @@ const { execSync } = require( 'child_process' );
 
 dotenvExpand( dotenv.config() );
 
-// Execute any docker-compose command passed to this script.
-execSync( 'docker-compose ' + process.argv.slice( 2 ).join( ' ' ), { stdio: 'inherit' } );
+// Execute any docker compose command passed to this script.
+execSync( 'docker compose ' + process.argv.slice( 2 ).join( ' ' ), { stdio: 'inherit' } );
diff --git a/tools/local-env/scripts/install.js b/tools/local-env/scripts/install.js
index 4a21b99953cb1..96c4143bbed97 100644
--- a/tools/local-env/scripts/install.js
+++ b/tools/local-env/scripts/install.js
@@ -45,7 +45,7 @@ wait_on( { resources: [ `tcp:localhost:${process.env.LOCAL_PORT}`] } )
  * @param {string} cmd The WP-CLI command to run.
  */
 function wp_cli( cmd ) {
-	execSync( `docker-compose run --rm cli ${cmd}`, { stdio: 'inherit' } );
+	execSync( `docker compose run --rm cli ${cmd}`, { stdio: 'inherit' } );
 }
 
 /**
@@ -54,6 +54,6 @@ function wp_cli( cmd ) {
 function install_wp_importer() {
 	const testPluginDirectory = 'tests/phpunit/data/plugins/wordpress-importer';
 
-	execSync( `docker-compose exec -T php rm -rf ${testPluginDirectory}`, { stdio: 'inherit' } );
-	execSync( `docker-compose exec -T php git clone https://github.com/WordPress/wordpress-importer.git ${testPluginDirectory} --depth=1`, { stdio: 'inherit' } );
+	execSync( `docker compose exec -T php rm -rf ${testPluginDirectory}`, { stdio: 'inherit' } );
+	execSync( `docker compose exec -T php git clone https://github.com/WordPress/wordpress-importer.git ${testPluginDirectory} --depth=1`, { stdio: 'inherit' } );
 }
diff --git a/tools/local-env/scripts/start.js b/tools/local-env/scripts/start.js
index cf184354507ef..6be2392945de0 100644
--- a/tools/local-env/scripts/start.js
+++ b/tools/local-env/scripts/start.js
@@ -5,7 +5,10 @@ const { execSync } = require( 'child_process' );
 dotenvExpand( dotenv.config() );
 
 // Start the local-env containers.
-execSync( 'docker-compose up -d wordpress-develop', { stdio: 'inherit' } );
+const containers = ( process.env.LOCAL_PHP_MEMCACHED === 'true' )
+	? 'wordpress-develop memcached'
+	: 'wordpress-develop';
+execSync( `docker-compose up -d -- ${containers}`, { stdio: 'inherit' } );
 
 // If Docker Toolbox is being used, we need to manually forward LOCAL_PORT to the Docker VM.
 if ( process.env.DOCKER_TOOLBOX_INSTALL_PATH ) {