Correct npm installation in GitHub actions

Author: hkdobrev

.github/workflows/js_test.yml

@@ -4,6 +4,7 @@ on: [push]
 
 jobs:
   build:
+
     runs-on: ubuntu-latest
 
     strategy:
@@ -16,8 +17,10 @@ jobs:
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
-    - name: npm test
+    - name: npm install, build, and test
       run: |
+        npm ci
+        npm run build --if-present
         npm test
       env:
         CI: true