fix(cicd): run the app in the background

Author: timoa

.github/workflows/nodejs.yml

@@ -162,7 +162,7 @@ jobs:
           mongodb-db: encryptionAPI
 
       - name: Start the app
-        run: npm start & npx wait-on http://localhost:3000
+        run: npm start > /dev/null &
 
       - name: Run ZAP Scan
         uses: zaproxy/action-full-scan@v0.4.0