feat(workflows): add lint code job

.github/workflows/test.js.yml

@@ -10,8 +10,25 @@ on:
     branches: [ master ]
 
 jobs:
-  build:
+  code:
+    name: lint code
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
 
+      - name: Use Node.js 12
+        uses: actions/setup-node@v1
+        with:
+          node-version: "12"
+
+      - name: Install dependencies
+        uses: bahmutov/npm-install@v1
+
+      - name: Run ESLint
+        run: npm run lint
+
+  build:
     runs-on: ubuntu-latest
 
     strategy:
@@ -29,3 +46,4 @@ jobs:
     - run: npm ci
     - run: npm run build --if-present
     - run: npm test
+