ci: add workflow to sync fork from upstream main

Co-authored-by: animesh-garg <1613964+animesh-garg@users.noreply.github.com>

Author: Copilot

.github/workflows/sync-upstream.yml

@@ -0,0 +1,31 @@
+name: Sync fork with upstream
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 3 * * 1"
+
+permissions:
+  contents: write
+
+jobs:
+  sync-upstream:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Configure Git
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+
+      - name: Merge upstream main into fork main
+        run: |
+          git remote add upstream https://github.com/alshedivat/al-folio.git
+          git fetch upstream main
+          git checkout main
+          git merge --no-edit upstream/main
+          git push origin main