Add monthly Google Drive cleanup workflow

Author: danifranco

.github/workflows/google_drive_cleanup.yml

@@ -0,0 +1,34 @@
+name: Google Drive Cleanup (monthly)
+
+on:
+  schedule:
+    - cron: "0 0 1 * *"  # Runs at 00:00 UTC on the 1st of each month
+  workflow_dispatch:
+
+jobs:
+  cleanup:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Install Google API dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install --upgrade google-api-python-client google-auth google-auth-httplib2 google-auth-oauthlib
+
+      - name: Decode Drive credentials
+        run: |
+          echo "${{ secrets.DRIVE_CREDENTIALS }}" | base64 -d > sa.json
+
+      - name: Run cleanup script
+        run: |
+          python gdrive_old_files_cleanup.py
+          echo "✅ Google Drive cleanup completed"