Merge pull request #250 from openedx/abdullahwaheed/run-build-in-ci

`npm run build` script in Github CI

.github/workflows/ci.yml

@@ -29,6 +29,8 @@ jobs:
       run: npm run lint
     - name: Test
       run: npm run test
+    - name: Build
+      run: npm run build
     - name: i18n_extract
       run: npm run i18n_extract
     - name: Coverage