Add JSON validation for PRs

.github/workflows/validateJson.yml

@@ -0,0 +1,16 @@
+name: JSON check
+
+on:
+  pull_request:
+    paths:
+      - '**.json'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: json-syntax-check
+        uses: limitusus/[email protected]
+        with:
+          pattern: "\\.json$"