chore: action for automatically creating sync to main pr after a rele…

…ase (#4698)

.github/workflows/sync-release.yaml

@@ -0,0 +1,87 @@
+name: sync release
+
+on:
+  pull_request:
+    types:
+      - closed
+
+jobs:
+  sync:
+    env:
+      GH_TOKEN: ${{ secrets.PAT }}
+    if: "${{ github.event.pull_request.merged && startsWith(github.event.pull_request.base.ref, 'release/') && startsWith(github.event.pull_request.title, 'chore: release') && github.event.pull_request.user.login == 'devops-github-rudderstack' }}"
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: parse commit
+        run: |
+          MERGE_COMMIT_SHA=$(gh pr view ${{ github.event.pull_request.number }} --json mergeCommit -q .mergeCommit.oid)
+          echo "MERGE_COMMIT_SHA=$MERGE_COMMIT_SHA" >> "$GITHUB_ENV"
+      
+      - name: parse release tag
+        run: |
+          while [ -n $(git describe --contains $MERGE_COMMIT_SHA && echo "ok" || echo "") ]; do
+            echo "waiting for release...";
+            sleep 2
+            git fetch --tags
+          done;
+          RELEASE_TAG=$(git describe --contains $MERGE_COMMIT_SHA)
+          echo "RELEASE_TAG=$RELEASE_TAG" >> "$GITHUB_ENV"
+      
+      - name: create branch
+        run: |
+          PR_BRANCH="sync-release-${MERGE_COMMIT_SHA}"
+          echo "PR_BRANCH=$PR_BRANCH" >> "$GITHUB_ENV"
+          git checkout $MERGE_COMMIT_SHA -b $PR_BRANCH
+          git push origin $PR_BRANCH
+      
+      - name: create pull request for major or minor release
+        if: ${{ endsWith(env.RELEASE_TAG, '.0') }}
+        run: |
+          COMMIT_OVERRIDE=$(git rev-list --reverse --pretty="%s" --cherry-pick --right-only ${PR_BRANCH}...origin/master | grep -v "commit" | grep -v "chore: sync #" || echo "")
+          
+          echo "# Description" >> body
+          echo "" >> body
+          echo "Syncing release ${RELEASE_TAG} to main branch" >> body
+          echo "" >> body
+          echo "**WARNING: Do NOT rewrite git history and ALWAYS use a \"Merge Commit\" for merging!**" >> body
+          echo "" >> body
+          echo "**↓↓ Please review and edit commit overrides before merging ↓↓**" >> body
+          echo "" >> body
+          echo "BEGIN_COMMIT_OVERRIDE" >> body
+          echo "${COMMIT_OVERRIDE}" >> body
+          echo "END_COMMIT_OVERRIDE" >> body
+          
+          gh pr create \
+          --title "chore: sync release ${RELEASE_TAG} to main branch" \
+          --body "$(cat body)" \
+          --base master \
+          --head $PR_BRANCH \
+          --assignee '${{ github.event.pull_request.merged_by.login }}'
+      
+      - name: create pull request for patch release
+        if: ${{ ! endsWith(env.RELEASE_TAG, '.0') }}
+        run: |
+          COMMIT_OVERRIDE=$(git rev-list --reverse --pretty="%s" --cherry-pick --right-only origin/master...${PR_BRANCH} | grep -v "commit" | grep -v "chore: release" || echo "")
+
+          echo "# Description" >> body
+          echo "" >> body
+          echo "Syncing patch release ${RELEASE_TAG} to main branch" >> body
+          echo "" >> body
+          echo "**↓↓ Please review and edit commit overrides before merging ↓↓**" >> body
+          echo "" >> body
+          echo "BEGIN_COMMIT_OVERRIDE" >> body
+          echo "${COMMIT_OVERRIDE}" >> body
+          echo "END_COMMIT_OVERRIDE" >> body
+          
+          gh pr create \
+          --title "chore: sync release ${RELEASE_TAG} to main branch" \
+          --body "$(cat body)" \
+          --base master \
+          --head $PR_BRANCH \
+          --assignee '${{ github.event.pull_request.merged_by.login }}'