ci(renovate): add config validation job (#4303)

.github/renovate.json5

@@ -3,12 +3,12 @@
   extends: ["config:recommended"],
   packageRules: [
     {
-      matchPackagePatterns: ["^@homarr/"],
+      matchPackageNames: ["^@homarr/"],
       enabled: false,
     },
     // Reenable once https://github.com/privatenumber/tsx/issues/737 is fixed
     {
-      matchPackagePatterns: ["tsx"],
+      matchPackageNames: ["tsx"],
       enabled: false,
     },
     {

.github/workflows/on-pr-renovate-validate.yml

@@ -0,0 +1,18 @@
+name: "[Renovate] Validate configuration"
+
+permissions:
+  contents: read
+
+on:
+  pull_request:
+    branches: ["*"]
+    paths: [".github/renovate.json5"]
+
+jobs:
+  renovate-validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - run: |
+          npx --yes --package renovate -- \
+              renovate-config-validator --strict .github/renovate.json5