Create sync-fork.yml

.github/workflows/sync-fork.yml

@@ -0,0 +1,52 @@
+name: Sync fork with upstream
+
+on:
+  schedule:
+    # Daily at 03:00 UTC
+    - cron: "0 3 * * *"
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout fork default branch
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Sync from upstream
+        env:
+          # IMPORTANT: change this to the original source repository
+          UPSTREAM_REPO: "ORIGINAL_OWNER/ORIGINAL_REPO"
+          # Optional: set your branch explicitly if not default branch behavior
+          TARGET_BRANCH: "main"
+        run: |
+          set -euo pipefail
+
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+
+          # Ensure we're on target branch
+          git checkout "${TARGET_BRANCH}"
+
+          # Add/update upstream remote
+          if git remote get-url upstream >/dev/null 2>&1; then
+            git remote set-url upstream "https://github.com/${UPSTREAM_REPO}.git"
+          else
+            git remote add upstream "https://github.com/${UPSTREAM_REPO}.git"
+          fi
+
+          # Fetch and fast-forward only
+          git fetch upstream
+          git merge --ff-only "upstream/${TARGET_BRANCH}" || {
+            echo "Fast-forward failed (diverged history). Manual intervention required."
+            exit 1
+          }
+
+          # Push only if branch moved
+          git push origin "${TARGET_BRANCH}"