Tweak Github Actions steps

Author: Caligatio

.github/workflows/main.yml

@@ -12,9 +12,11 @@ jobs:
         node-version: 'latest'
     - uses: browser-actions/setup-chrome@v1
     - uses: browser-actions/setup-firefox@v1
-    - name: Run Karma Tests
+    - name: Install dependencies
+      run: npm install
+    - name: Run source tests
+      run: npm run test
+    - name: Build and run dist/ tests
       run: |
-        npm install
-        npm run test
         npm run build 
         npm run test_dist