[CI] Add a ESLint check

.github/workflows/checks.yml

@@ -37,6 +37,17 @@ jobs:
       - name: Run Rubocop
         run: $DOCKER_RUN rubocop --format github
 
+  eslint:
+    runs-on: ubuntu-22.04
+    needs: docker-build
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./.github/prepare-docker-image
+
+      - name: Run ESLint
+        run: $DOCKER_RUN linter
+
   tests:
     runs-on: ubuntu-22.04
     needs: docker-build

package.json

@@ -31,6 +31,6 @@
     "globals": "^15.8.0"
   },
   "scripts": {
-    "lint": "yarn run eslint ./app/javascript/src/**/*.js"
+    "lint": "yarn run eslint ./app/javascript/src/**/*.js --no-fix --max-warnings 0"
   }
 }