GitHub Actions: npm run lint (#746)

Author: benmccann

.github/workflows/ci.yml

@@ -23,6 +23,7 @@ jobs:
           node-version: ${{ matrix.node-version }}
       - run: npm ci
       - run: npm audit
+      - run: npm run lint
       # - run: npm run update-crosswalk  # To support newer versions of Node.js
       - run: npm run build --if-present
       - run: npm test