add renovate GitHub Action and json config

.github/workflows/renovate.yaml

@@ -0,0 +1,25 @@
+name: Renovate
+on:
+  schedule:
+    # Run every day at 1 AM UTC (before the nightly build at 2 AM UTC)
+    - cron: '0 1 * * *'
+  # Allow manual triggering
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+  issues: write
+
+jobs:
+  renovate:
+    name: Run Renovate
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Self-hosted Renovate
+        uses: renovatebot/github-action@v41.0.3
+        with:
+          configurationFile: renovate.json
+          token: ${{ secrets.GITHUB_TOKEN }}