ci: add renovate github action

.github/workflows/renovate.yml

@@ -0,0 +1,19 @@
+name: Renovate
+on:
+  # This lets you dispatch a renovate job
+  workflow_dispatch:
+
+  # schedule:
+  #   # Run every 30 minutes:
+  #   - cron: '0,30 * * * *'
+jobs:
+  renovate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4.1.4
+      - name: Self-hosted Renovate
+        uses: renovatebot/github-action@v40.1.11
+        with:
+          configurationFile: .github/renovate.json
+          token: ${{ secrets.RENOVATE_TOKEN }}