Boxy seems to randomly restart after running out of memory. We do not
yet know the reason behind the increased memory usage, but zram might
help a bit.

With the ongoing git migration[1] our GitLab will gain a lot more usage,
so GitLab should get the default ssh port and then DevOps can use a
non-standard port.

We will redirect the old port (222) to the new port for some time, so
fetching won't break for existing local repositories.

[1] https://archlinux.org/news/git-migration-announcement/

Signed-off-by: Leonidas Spyropoulos <artafinde@archlinux.org>

These are used to signal the start of the document in a stream of many
documents. As Ansible only supports one YAML document per file this is
unnecessary. About a third of our YAML documents already lacked these.

Using GitLab's official backup tool takes too much time and, more
importantly, space; /srv/gitlab is a bit over 430G but backing it
up nearly exhausts its 1TB volume.

As we're creating btrfs snapshots and backing those up with borg, it
seems unnecessary to also create tarballs of the same data. GitLab's
documentation mentions snapshots as a viable backup strategy, and to
the restored system it should seem like recovering from a power loss.

[1] https://docs.gitlab.com/ee/raketasks/backup_restore#alternative-backup-strategies

This is meant as a internal authenticated and encrypted network which we
can use for internal services, we don't want to expose to the internet
or when encryption is desired but not easily implementable.

Zabbix has been replaced by Prometheus for monitoring our services.

Added missing hosts file for gitlab.archlinux.org to make sure the playbook
runs correctly.

Signed-off-by: Florian Pritz <bluewind@xinu.at>