Create check-sync.yml

.github/workflows/check-sync.yml

@@ -0,0 +1,33 @@
+name: Check Sync with Main
+
+on:
+  pull_request:
+    types: [synchronize, opened, reopened]
+  push:
+    branches:
+      - main
+
+jobs:
+  check-sync:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+      with:
+        ref: ${{ github.event.pull_request.head.ref }}
+        repository: ${{ github.event.pull_request.head.repo.full_name }}
+        fetch-depth: 0  # Fetch all history for all branches and tags
+
+    - name: Fetch main branch
+      run: |
+        git fetch origin main
+
+    - name: Check if branch is up-to-date with main
+      run: |
+        git merge-base --is-ancestor origin/main HEAD
+    - name: Fail if not up-to-date
+      if: failure()
+      run: |
+        echo "The branch is not up-to-date with main. Please rebase or merge main into your branch."
+        exit 1