Add scheduled maintenance workflow

.gitea/workflows/maintenance.yaml

@@ -0,0 +1,17 @@
+
+name: Weekly Maintenance
+on:
+  schedule:
+    - cron: '0 0 * * 0' # Every Sunday at midnight
+  workflow_dispatch:
+
+jobs:
+  maintain:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Run maintenance script
+        run: |
+          chmod +x scripts/maintenance.sh
+          ./scripts/maintenance.sh