#3: Add npm script to fetch and build grammar.

Author: yegor256

.github/workflows/build.yml

@@ -34,6 +34,7 @@ jobs:
           node-version: ${{ matrix.node-version }}
       - run: npm i
       - run: npm run lint
+      - run: npm run fetch-and-build-grammar
       - run: npm run unit-test
       - run: npm run build
       - run: npm run package