Run linter on GitHub Actions

Author: carlobeltrame

.github/workflows/continuous-integration.yml

@@ -38,3 +38,26 @@ jobs:
           COVERALLS_SERVICE_NAME: github
           COVERALLS_SERVICE_NUMBER: ${{ github.run_id }}
           CI_PULL_REQUEST: ${{ github.event.number }}
+
+  lint:
+    name: "Linter"
+    runs-on: ubuntu-latest
+    steps:
+
+      - uses: actions/checkout@v2
+
+      - uses: actions/cache@v2
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+
+      - name: Setup node
+        uses: actions/setup-node@v2
+        with:
+          node-version: 14
+
+      - run: npm ci
+
+      - run: npm run lint