Merge pull request #173 from pantheon-systems/BUGS-6560-Tag-Branches

[BUGS-6560]: Provides creation of branch on tag push.

.github/workflows/create-branch-on-tag.yml

@@ -0,0 +1,63 @@
+name: Create Branch on Tag Push
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  create-branch:
+    runs-on: ubuntu-latest
+    if: ${{ github.repository == 'pantheon-systems/search_api_pantheon' }}
+    env:
+      BRANCH: ${{ github.ref_name }}
+      WORKSPACE: ${{ github.workspace }}
+      DRUPAL_ORG_REMOTE: ${{ secrets.DRUPAL_ORG_REMOTE }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Install SSH key
+        uses: shimataro/ssh-key-action@v2
+        with:
+          key: ${{ secrets.SSH_KEY }}
+          known_hosts: ${{ secrets.KNOWN_HOSTS }}
+          if_key_exists: ignore
+      - name: Extract tag name
+        id: tag_name
+        run: |
+          FULL_TAG=${GITHUB_REF#refs/tags/}
+          MAJOR_MINOR="$(echo $FULL_TAG | cut -d '.' -f 1,2).x"
+          MAJOR_ONLY="$(echo $FULL_TAG | cut -d '.' -f 1).x"
+          echo "BRANCH_NAME=$MAJOR_MINOR" >> $GITHUB_OUTPUT
+          echo "MAJOR_BRANCH_NAME=$MAJOR_ONLY" >> $GITHUB_OUTPUT
+      - name: Check if branch exists
+        id: check_branch
+        run: |
+          git fetch
+          branch_existence=$(git ls-remote --heads origin ${{ steps.tag_name.outputs.BRANCH_NAME }})
+          if [[ -z ${branch_existence} ]]; then
+            echo "Branch for tag does not exist."
+            echo "exists=false" >> $GITHUB_OUTPUT
+          else
+            echo "Branch for tag already exists."
+            echo "exists=true" >> $GITHUB_OUTPUT
+          fi
+      - name: Create branch
+        if: steps.check_branch.outputs.exists == 'false'
+        run: |
+          git checkout -b ${{ steps.tag_name.outputs.BRANCH_NAME }} origin/${{ steps.tag_name.outputs.MAJOR_BRANCH_NAME }}
+          git push origin ${{ steps.tag_name.outputs.BRANCH_NAME }}
+      - name: Merge changes from current default branch
+        if: steps.check_branch.outputs.exists == 'true'
+        run: |
+          git fetch
+          git checkout -b ${{ steps.tag_name.outputs.BRANCH_NAME }} origin/${{ steps.tag_name.outputs.BRANCH_NAME }}
+          git merge origin/${{ steps.tag_name.outputs.MAJOR_BRANCH_NAME }}
+          git push origin HEAD:${{ steps.tag_name.outputs.BRANCH_NAME }}
+      - name: Pushes to drupal.org repository
+        run: |
+          cd $WORKSPACE
+          git remote add drupalorg $DRUPAL_ORG_REMOTE
+          git push drupalorg HEAD:${{ steps.tag_name.outputs.BRANCH_NAME }}