ci: check renovate config

Author: coderbyheart

.github/workflows/renovate-config-check.yaml

@@ -0,0 +1,18 @@
+name: Validate Renovate Config
+
+on:
+  push:
+    paths:
+      - "renovate.json"
+  pull_request:
+    paths:
+      - "renovate.json"
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Validate renovate.json
+        run: npx --yes --package renovate -- renovate-config-validator