Follow-up to [1]; while most of our cloud servers are in Helsinki, the
latency from most of Europe is lower when accessing servers in Germany.
Pinging from multiple locations using ping.pe, the latency to Nuremberg
from most locations appears to be 10-20ms lower (compared to Helsinki).
[1] https://gitlab.archlinux.org/archlinux/infrastructure/-/merge_requests/500
With Hetzner now having a datacenter in the US[1], we don't want to
accidentally create a server in the US, so let's always create them in
Helsinki where most of our cloud servers are.
[1] https://www.hetzner.com/news/11-21-usa-cloud/
machine.domain has been an mandatory attribute which creates
<domain>.archlinux.org entries automagically. For migrations this can be
a problem if <domain>.archlinux.org supposed to point to a different
machine. Adding the new machine with the same domain leads to additional
DNS entries. The DNS ends up pointing to both machines in this case.
By making the domain attribute optional for machines, we allow the new
machines to be created without any domain pointing to them.
