diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index 6678d91b16bc4..8d02acda8afff 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -40,57 +40,25 @@ 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 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 NodeJS.
-  # - Logs updated debug information.
-  # _ Installs npm dependencies.
-  # - Run the WordPress JSHint checks.
   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: Set up 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
 
   slack-notifications:
     name: Slack Notifications
     uses: WordPress/wordpress-develop/.github/workflows/slack-notifications.yml@trunk
+    permissions:
+      actions: read
+      contents: read
     needs: [ jshint ]
     if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name != 'pull_request' && always() }}
     with:
@@ -104,6 +72,8 @@ jobs:
   failed-workflow:
     name: Failed workflow tasks
     runs-on: ubuntu-latest
+    permissions:
+      actions: write
     needs: [ jshint, slack-notifications ]
     if: |
       always() &&
@@ -116,7 +86,7 @@ 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/javascript-tests.yml b/.github/workflows/javascript-tests.yml
index 266ab52a07d3b..76040d9f511ed 100644
--- a/.github/workflows/javascript-tests.yml
+++ b/.github/workflows/javascript-tests.yml
@@ -38,53 +38,25 @@ 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 NodeJS.
-  # - Logs updated debug information.
-  # _ Installs npm dependencies.
-  # - Run the WordPress QUnit 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: Set up 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
-
   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:
@@ -98,6 +70,8 @@ jobs:
   failed-workflow:
     name: Failed workflow tasks
     runs-on: ubuntu-latest
+    permissions:
+      actions: write
     needs: [ test-js, slack-notifications ]
     if: |
       always() &&
@@ -110,7 +84,7 @@ 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 bfe029e83b1a7..84890e0dd03d5 100644
--- a/.github/workflows/phpunit-tests.yml
+++ b/.github/workflows/phpunit-tests.yml
@@ -21,115 +21,35 @@ on:
 
 # 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.
+  # 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:
-  LOCAL_DIR: build
-  PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: ${{ true }}
-  COMPOSER_INSTALL: ${{ false }}
-  # 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'
+# Disable permissions for all available scopes by default.
+# Any needed permissions should be configured at the job level.
+permissions: {}
 
 jobs:
-  # Sets up WordPress for testing or development use.
   #
-  # Performs the following steps:
-  # - Cancels all previous workflow runs for pull requests that have not completed.
-  # - Checks out the repository.
-  # - Logs debug information about the GitHub Action runner.
-  # - Installs NodeJS.
-  # _ Installs npm dependencies.
-  # - Builds WordPress to run from the `build` directory.
-  # - Creates a ZIP file of compiled WordPress.
-  # - Uploads ZIP file as an artifact.
-  setup-wordpress:
-    name: Setup WordPress
-    runs-on: ubuntu-latest
-    if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
-
-      - name: Log debug information
-        run: |
-          echo "$GITHUB_REF"
-          echo "$GITHUB_EVENT_NAME"
-          npm --version
-          node --version
-          curl --version
-          git --version
-          svn --version
-          php --version
-          php -i
-          locale -a
-
-      - name: Set up Node.js
-        uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3.6.0
-        with:
-          node-version-file: '.nvmrc'
-          cache: npm
-
-      - name: Install Dependencies
-        run: npm ci
-
-      - name: Build WordPress
-        run: npm run build
-
-      - name: Create ZIP artifact
-        uses: thedoctor0/zip-release@a24011d8d445e4da5935a7e73c1f98e22a439464 # v0.7.1
-        with:
-          filename: built-wp-${{ github.sha }}.zip
-          exclusions: '*.git* /*node_modules/* packagehash.txt'
-
-      - name: Upload build artifact
-        uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce # v3.1.2
-        with:
-          name: built-wp-${{ github.sha }}
-          path: built-wp-${{ github.sha }}.zip
-          if-no-files-found: error
-
-  # Runs the PHPUnit tests for WordPress.
+  # Creates a PHPUnit test job for each PHP combination.
   #
-  # Performs the following steps:
-  # - Sets environment variables.
-  # - Sets up the environment variables needed for testing with memcached (if desired).
-  # - Downloads the built WordPress artifact from the previous job.
-  # - Unzips the artifact.
-  # - Installs NodeJS.
-  # _ Installs npm dependencies.
-  # - Configures caching for Composer.
-  # _ Installs Composer dependencies (if desired).
-  # - 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.
-  # - 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.
   test-php:
-    name: ${{ matrix.php }}${{ matrix.multisite && ' multisite' || '' }}${{ matrix.split_slow && ' slow tests' || '' }}${{ matrix.memcached && ' with memcached' || '' }} on ${{ matrix.os }}
-    needs: setup-wordpress
-    runs-on: ${{ matrix.os }}
-    timeout-minutes: 20
+    name: PHP ${{ matrix.php }}
+    uses: WordPress/wordpress-develop/.github/workflows/reusable-phpunit-tests-v1.yml@trunk
+    permissions:
+      contents: read
+    secrets: inherit
+    if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}
     strategy:
       fail-fast: false
       matrix:
-        php: [ '5.3', '5.4', '5.5' ]
         os: [ ubuntu-latest ]
-        memcached: [ false ]
+        php: [ '5.3', '5.4', '5.5' ]
         split_slow: [ false, true ]
         multisite: [ false, true ]
+        memcached: [ false ]
+
         include:
           # Additional "slow" jobs for PHP 5.6.
           - php: '5.6'
@@ -177,141 +97,22 @@ jobs:
             multisite: false
             split_slow: false
 
-    env:
-      LOCAL_PHP: ${{ matrix.php }}-fpm
-      LOCAL_PHPUNIT: ${{ matrix.phpunit && matrix.phpunit || 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)" >> $GITHUB_ENV
-
-      - name: Download the built WordPress artifact
-        uses: actions/download-artifact@9bc31d5ccc31df68ecc42ccf4149144866c47d8a # v3.0.2
-        with:
-          name: built-wp-${{ github.sha }}
-
-      - name: Unzip built artifact
-        run: unzip built-wp-${{ github.sha }}.zip
-
-      - name: Set up Node.js
-        uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3.6.0
-        with:
-          node-version-file: '.nvmrc'
-          cache: npm
-
-      - name: Install Dependencies
-        run: npm ci
-
-      - name: Cache Composer dependencies
-        if: ${{ env.COMPOSER_INSTALL == true }}
-        uses: actions/cache@69d9d449aced6a2ede0bc19182fadc3a0a42d2b0 # v3.2.6
-        env:
-          cache-name: cache-composer-dependencies
-        with:
-          path: ${{ steps.composer-cache.outputs.dir }}
-          key: ${{ runner.os }}-php-${{ matrix.php }}-composer-${{ hashFiles('**/composer.lock') }}
-
-      - name: Install Composer dependencies
-        if: ${{ env.COMPOSER_INSTALL == true }}
-        run: |
-          docker-compose run --rm php composer --version
-          docker-compose run --rm php composer install
-
-      - 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 build/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: ${{ ! matrix.multisite && ! matrix.split_slow }}
-        run: npm run test:${{ 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
-
-      - 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: Set up the Git repository
-        if: ${{ github.repository == 'WordPress/wordpress-develop' && github.ref == 'refs/heads/trunk' && matrix.report }}
-        run: |
-          git init
-          git remote add origin https://github.com/WordPress/wordpress-develop.git
-          git fetch
-          git reset origin/trunk
-
-      - 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 }}
+      phpunit: ${{ matrix.phpunit && matrix.phpunit || matrix.php }}
+      multisite: ${{ matrix.multisite }}
+      split_slow: ${{ matrix.split_slow }}
+      memcached: ${{ matrix.memcached }}
+      phpunit-config: ${{ matrix.multisite && 'tests/phpunit/multisite.xml' || 'phpunit.xml.dist' }}
 
   slack-notifications:
     name: Slack Notifications
     uses: WordPress/wordpress-develop/.github/workflows/slack-notifications.yml@trunk
-    needs: [ setup-wordpress, test-php ]
+    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' }}
@@ -324,6 +125,8 @@ jobs:
   failed-workflow:
     name: Failed workflow tasks
     runs-on: ubuntu-latest
+    permissions:
+      actions: write
     needs: [ test-php, slack-notifications ]
     if: |
       always() &&
@@ -336,7 +139,7 @@ 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/test-build-processes.yml b/.github/workflows/test-build-processes.yml
new file mode 100644
index 0000000000000..8e8077a2c862d
--- /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: [ '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: [ '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 cc0013808f560..0000000000000
--- a/.github/workflows/test-npm.yml
+++ /dev/null
@@ -1,176 +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 NodeJS.
-  # _ Installs npm dependencies.
-  # - Builds WordPress to run from the `build` directory.
-  # - Cleans up after building WordPress to the `build` directory.
-  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: Set up 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
-
-  # 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 NodeJS.
-  # _ Installs npm dependencies.
-  # - Builds WordPress to run from the `build` directory.
-  # - Cleans up after building WordPress to the `build` directory.
-  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: Set up 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
-
-  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/docker-compose.yml b/docker-compose.yml
index fbb2b6c36a34e..474aa44e586ce 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.
@@ -37,17 +38,17 @@ services:
       - wpdevnet
 
     environment:
-      LOCAL_PHP_XDEBUG: ${LOCAL_PHP_XDEBUG-false}
-      LOCAL_PHP_MEMCACHED: ${LOCAL_PHP_MEMCACHED-false}
-      PHP_FPM_UID: ${PHP_FPM_UID-1000}
-      PHP_FPM_GID: ${PHP_FPM_GID-1000}
+      - LOCAL_PHP_XDEBUG+${LOCAL_PHP_XDEBUG-false}
+      - LOCAL_PHP_MEMCACHED=${LOCAL_PHP_MEMCACHED-false}
+      - PHP_FPM_UID=${PHP_FPM_UID-1000}
+      - PHP_FPM_GID=${PHP_FPM_GID-1000}
 
     volumes:
       - ./tools/local-env/php-config.ini:/usr/local/etc/php/conf.d/php-config.ini
       - ./:/var/www
 
-    depends_on:
-      - mysql
+    # The init directive ensures the command runs with a PID > 1, so Ctrl+C works correctly.
+    init: true
 
   ##
   # The MySQL container.
@@ -71,6 +72,12 @@ 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.
   ##
@@ -81,10 +88,10 @@ services:
       - wpdevnet
 
     environment:
-      LOCAL_PHP_XDEBUG: ${LOCAL_PHP_XDEBUG-false}
-      LOCAL_PHP_MEMCACHED: ${LOCAL_PHP_MEMCACHED-false}
-      PHP_FPM_UID: ${PHP_FPM_UID-1000}
-      PHP_FPM_GID: ${PHP_FPM_GID-1000}
+      - LOCAL_PHP_XDEBUG=${LOCAL_PHP_XDEBUG-false}
+      - LOCAL_PHP_MEMCACHED=${LOCAL_PHP_MEMCACHED-false}
+      - PHP_FPM_UID=${PHP_FPM_UID-1000}
+      - PHP_FPM_GID=${PHP_FPM_GID-1000}
 
     volumes:
       - ./:/var/www
@@ -92,6 +99,12 @@ services:
     # The init directive ensures the command runs with a PID > 1, so Ctrl+C works correctly.
     init: true
 
+    depends_on:
+      php:
+        condition: service_started
+      mysql:
+        condition: service_healthy
+
   ##
   # The PHPUnit container.
   ##
@@ -102,16 +115,16 @@ services:
       - wpdevnet
 
     environment:
-      LOCAL_PHP_XDEBUG: ${LOCAL_PHP_XDEBUG-false}
-      LOCAL_PHP_MEMCACHED: ${LOCAL_PHP_MEMCACHED-false}
-      LOCAL_DIR: ${LOCAL_DIR-src}
-      WP_MULTISITE: ${WP_MULTISITE-false}
-      PHP_FPM_UID: ${PHP_FPM_UID-1000}
-      PHP_FPM_GID: ${PHP_FPM_GID-1000}
-      TRAVIS_BRANCH: ${TRAVIS_BRANCH-false}
-      TRAVIS_PULL_REQUEST: ${TRAVIS_PULL_REQUEST-false}
-      GITHUB_REF: ${GITHUB_REF-false}
-      GITHUB_EVENT_NAME: ${GITHUB_EVENT_NAME-false}
+      - LOCAL_PHP_XDEBUG=${LOCAL_PHP_XDEBUG-false}
+      - LOCAL_PHP_MEMCACHED=${LOCAL_PHP_MEMCACHED-false}
+      - LOCAL_DIR=${LOCAL_DIR-src}
+      - WP_MULTISITE=${WP_MULTISITE-false}
+      - PHP_FPM_UID=${PHP_FPM_UID-1000}
+      - PHP_FPM_GID=${PHP_FPM_GID-1000}
+      - TRAVIS_BRANCH=${TRAVIS_BRANCH-false}
+      - TRAVIS_PULL_REQUEST=${TRAVIS_PULL_REQUEST-false}
+      - GITHUB_REF=${GITHUB_REF-false}
+      - GITHUB_EVENT_NAME=${GITHUB_EVENT_NAME-false}
 
     volumes:
       - ./tools/local-env/phpunit-config.ini:/usr/local/etc/php/conf.d/phpunit-config.ini
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 2bce37b03bd6d..5b60d4c11ab26 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' } );
 }
 
 /**
@@ -54,5 +54,5 @@ function wp_cli( cmd ) {
 function install_wp_importer() {
 	const test_plugin_directory = 'tests/phpunit/data/plugins/wordpress-importer';
 
-	execSync( `docker-compose exec -T php rm -rf ${test_plugin_directory} && svn checkout -r ${process.env.WP_IMPORTER_REVISION} https://plugins.svn.wordpress.org/wordpress-importer/trunk/ ${test_plugin_directory}`, { stdio: 'inherit' } );
+	execSync( `docker compose exec -T php rm -rf ${test_plugin_directory} && svn checkout -r ${process.env.WP_IMPORTER_REVISION} https://plugins.svn.wordpress.org/wordpress-importer/trunk/ ${test_plugin_directory}`, { stdio: 'inherit' } );
 }
diff --git a/tools/local-env/scripts/start.js b/tools/local-env/scripts/start.js
index cf184354507ef..c8131037d6a8f 100644
--- a/tools/local-env/scripts/start.js
+++ b/tools/local-env/scripts/start.js
@@ -5,7 +5,7 @@ const { execSync } = require( 'child_process' );
 dotenvExpand( dotenv.config() );
 
 // Start the local-env containers.
-execSync( 'docker-compose up -d wordpress-develop', { stdio: 'inherit' } );
+execSync( 'docker compose up -d wordpress-develop', { 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 ) {