Add GraphQL schema linting to CI

.github/workflows/build.yml

@@ -211,9 +211,40 @@ jobs:
         tags: datasqrl/examples:${{ matrix.tag && matrix.tag != '' && matrix.tag || matrix.path }}
         platforms: linux/amd64,linux/arm64
 
+  lint-graphql:
+    name: Lint GraphQL Schemas
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Lint GraphQL schemas
+        run: |
+          SCHEMAS=$(find . -name "*.graphqls" -type f)
+          if [ -z "$SCHEMAS" ]; then
+            echo "No GraphQL schemas found"
+            exit 0
+          fi
+
+          LINT_OPTS="--rules fields-are-camel-cased,types-are-capitalized,enum-values-all-caps,input-object-values-are-camel-cased"
+          IGNORE='{"fields-are-camel-cased":["Query.Shipment","Query.Vehicle","Query.Customer"]}'
+          FAILED=0
+
+          for schema in $SCHEMAS; do
+            echo "::group::Checking $schema"
+            output=$(docker run --rm -v "$PWD":/app -w /app node:18-slim npx graphql-schema-linter $LINT_OPTS --ignore "$IGNORE" "$schema" 2>&1)
+            result=$?
+            echo "$output" | grep -v "^npm"
+            echo "::endgroup::"
+            if [ $result -ne 0 ]; then
+              FAILED=1
+            fi
+          done
+
+          exit $FAILED
+
   ci-summary:
     name: build ✅ summary
-    needs: build
+    needs: [build, lint-graphql]
     runs-on: ubuntu-latest
     if: always()
     steps: