fix: suppress nginx service start output in docker-init.sh

- Redirected the output of the nginx service start command to /dev/null to prevent cluttering the console with unnecessary messages during server startup.
- This change enhances the user experience by providing a cleaner output when initializing the Docker environment.

docker/bin/docker-init.sh

@@ -2,7 +2,7 @@
 
 if [ "${CRAWLAB_NODE_MASTER}" == "Y" ]; then
     # Start nginx
-    service nginx start
+    service nginx start >> /dev/null 2>&1
 fi
 
 # Start backend