Docker login not working on cluster nodes

[jefflill]

@marcusbooyah reported that docker login isn't working on cluster nodes:

sysadmin@control-0:~$ sudo su -
root@control-0:~# docker login registry.neon.local
Username: root
Password:
Error: authenticating creds for "registry.neon.local": pinging container registry registry.neon.local: invalid status code from registry 503 (Service Unavailable)

[4:19](https://neonforge.slack.com/archives/D012RGVUTV3/p1710976775737109)
╰─❯ docker login neon-registry.180e-5efd-ea85-8cc8.neoncluster.io
Username: root
Password:

Login Succeeded

[marcusbooyah]

This was an issue with the cluster definition