Add build step

Author: jvwong

.github/workflows/ci-cd.yml

@@ -44,6 +44,12 @@ jobs:
       - name: Test with mocha
         run: npm run coverage
 
+      #----------------------------------------------
+      #       build
+      #----------------------------------------------
+      - name: Build code
+        run: npm run build
+
       #----------------------------------------------
       #              reporting
       #----------------------------------------------