Cloudmin uses host system fqdn

How do I use the domain the customer wants. Everytime I create a VPS it uses something like host.cloudmin.domain.tld which is the fqdn for the host. How do I assign the customer domain here?

I know I can do it from the cli but there will come a day when the customer will ask.

Here is what I am talking about -> Adding DNS entry for IP address …
… done