frontend can run as default user

overlay/etc/supervisor.d/vnc.ini

@@ -18,7 +18,7 @@ stderr_logfile_backups=7
 priority=30
 autostart=false
 autorestart=true
-user=root
+user=%(ENV_USER)s
 command=/opt/frontend/utils/run.sh --web-port %(ENV_PORT_NOVNC_WEB)s --remote-host localhost --vnc-port %(ENV_PORT_VNC)s --audio-port %(ENV_PORT_AUDIO_STREAM)s
 environment=HOME="/home/%(ENV_USER)s",USER="%(ENV_USER)s"
 stopsignal=INT