FIX: running tests in pwa folder instead of project root

.github/workflows/pwa-tests.yml

@@ -16,6 +16,7 @@ jobs:
         uses: actions/setup-node@v1
         with:
           node-version: ${{ matrix.node-version }}
+      - run: cd pwa 
       - run: npm install
       - run: npm run build
       - run: npm test