Add create-pr yaml and sh

.github/workflows/create-pr.yaml

@@ -0,0 +1,27 @@
+name: Create charts PR
+
+on:
+  workflow_dispatch:
+  workflow_run:
+    workflows: [ "Build and push images" ]
+    types:
+      - completed
+    branches:
+      - main
+
+jobs:
+  create_pr:
+    name: Create charts PR
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout datagovuk_publish repository
+        uses: actions/checkout@v4
+        with:
+          repository: alphagov/datagovuk_publish
+          path: ckanext
+      - run: bash ./docker/create-pr.sh
+        env:
+          GH_TOKEN: ${{ secrets.PR_GITHUB_TOKEN }}
+          GH_REF: ${{ github.ref_name }}
+          IS_TAG: "false"
+          ENVS: "integration"

docker/create-pr.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+
+set -eux
+
+if [[ ${IS_TAG:-} = "true" ]]; then
+  export IMAGE_TAG="${GH_REF}"
+  export SOURCE_BRANCH="main"
+else
+  export IMAGE_TAG=$(gh api repos/alphagov/datagovuk_publish/branches/${GH_REF} | jq .commit.sha -r)
+  export SOURCE_BRANCH=${GH_REF}
+fi
+
+git config --global user.email "[email protected]"
+git config --global user.name "govuk-ci"
+
+git clone https://${GH_TOKEN}@github.com/alphagov/govuk-dgu-charts.git charts
+
+cd charts/charts/datagovuk/images
+
+for ENV in $(echo $ENVS | tr "," " "); do
+  (
+    BRANCH="ci/${IMAGE_TAG}-${ENV}"
+
+    if git show-ref --quiet refs/heads/${BRANCH}; then
+      echo "Branch ${BRANCH} already exists on govuk-dgu-charts"
+    else
+      git checkout -b ${BRANCH}
+
+      cd "${ENV}"
+      for APP in ckan pycsw solr; do
+        yq -i '.tag = env(IMAGE_TAG)' "${APP}.yaml"
+        yq -i '.branch = env(SOURCE_BRANCH)' "${APP}.yaml"
+        git add "${APP}.yaml"
+      done
+
+      if [[ $(git status | grep "nothing to commit") ]]; then
+        echo "Nothing to commit"
+      else
+        git commit -m "Update image tags for ${ENV} to ${IMAGE_TAG}"
+        git push --set-upstream origin "${BRANCH}"
+        gh pr create --title "Update image tags for ${ENV} (${IMAGE_TAG})" --base main --head "${BRANCH}" --fill
+      fi
+    fi
+  )
+done