ci: validate json schema files

.github/workflows/main.yml

@@ -0,0 +1,20 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Validate JSON
+        uses: emmanuelgautier/validate-json@main
+        with:
+          files: schemas/*.json

renovate.json

@@ -0,0 +1,5 @@
+{
+    "extends": [
+        "github>cerberauth/renovate-config"
+    ]
+}