chore: update GitHub Actions workflow to build for staging environment

Author: mois-ilya

.github/workflows/build-and-deploy.yml

@@ -27,7 +27,7 @@ jobs:
         run: npm install
 
       - name: Build
-        run: npm run build
+        run: npm run build:staging
 
       - name: Deploy to gh-pages
         uses: peaceiris/actions-gh-pages@v3