Every app answers at <name>.thebay.cloud from the moment you ship — before the
build has finished, in fact, which is what the Room is for.
Attaching your own
The command prints the DNS record to create. Once it resolves, a certificate is
issued and the domain starts serving.
An addition, never a replacement
The app keeps answering at <name>.thebay.cloud. That address is what every
share link, log line and rebuild is still built from — a custom domain is another
Door into the same app, not a move.
Access is separate from address
A domain does not make an app public. Visibility is its own setting:
See Access and domains. 
