add Renovate workflow for automated dependency updates

.gitea/workflows/renovate.yml

@@ -0,0 +1,22 @@
+name: Renovate
+
+on:
+  schedule:
+    - cron: '@daily'
+  workflow_dispatch:
+
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Run Renovate
+        uses: docker://renovate/renovate:41.27.0
+        env:
+          LOG_LEVEL: info
+          RENOVATE_TOKEN: ${{ secrets.RENOVATE_TOKEN }}
+          GITHUB_COM_TOKEN: ${{ secrets.PAT_TOKEN }}
+        with:
+          args: ''