keycloak: migrate to Quarkus distribution

See merge request !544

During the migration to Quarkus distribution we switched to the
packaged version of the theme (keycloak-archlinux-theme).

To be determined if we want to implement this rule.

This reverts commit 9d169a5b.

The relevant fixes have been included in systemd 250.4-2.

The intention of "unique" in "groups['buildservers'] | sort | unique"
was to account for combining multiple groups and passing them to the
sort and unique filters. However, with only one group it looks silly.

Use tier0 mirror on build servers

See merge request !543

There is a need for build servers to never build against outdated repo
databases, even with syncrepo providing a local mirror that is updated
every minute. To that effect, we adjust mirrorlist on build servers so
the first mirror is the tier0 mirror provided by gemini.

Keep the syncrepo role on build servers in order to have a local cache
of packages and avoid concurrent build jobs downloading the same files
causing them to be corrupted.

Finally, configure gemini to use its own repos (like other mirrors do).

Some users scrape our git endpoint with quite some requests per second
(32) this is not something cgit/smartgit can handle and has caused the
AUR to go down once (http 502).

Re-enable when all servers have been upgraded to systemd 251.

Order and exact values copied from the CF example in resolved.conf.

tf-stage1: standardize on TTL 3600 for DNS records

See merge request !542

The default TTL of 3600 seems a bit short for these.

Almost all of our DNS records have a TTL of 86400 (24 hours) with a few
using a TTL of 600 (some MX and TXT records). The former is too long to
be flexible when a need for fast change(s) arises, and the latter don't
benefit from the low TTL. Standardize on a TTL of 3600 (1 hour) for all
our records.

Keeps us from having to deal with .pacnew files.

Does not seem possible to communicate with hosts in the same subnet
without going through the gateway. Matches the configuration of our
other dedicated servers at Hetzner.

Indirect way to get "configure_network: true".

Fixes these display counters which were tied to aur.archlinux.org:

- Uptime
- RootFS Total
- RAM Total
- SWAP Total

Also add a decimal point to the latter two fields.

No changes made to it; this is to reduce noise in future modifications.

Avoid updating the cache in the same task w/ the upgrade as the former
causes the combined task to always return changed=True. For up-to-date
hosts, stop early instead of following through to the end and skipping
the final reboot task.

Before Ansible 5.4.0, combined cache update + package upgrade would not
always return changed=True but instead depended on whether the were any
packages to upgrade.

Gives the option to downgrade a server in the future, similar to the
default on Hetzner's Cloud Console ("CPU and RAM only").

250 is not a nice round number, whereas 200 is.

Add vault variables described in !532 (for aur-dev this time).

geoipupdate: implement role for use on geo mirrors

See merge request !541

This reverts commit c8d1a39a

Onboard kevr as project maintainer

Closes #438

See merge request !536