Onboard artafinde as Junior DevOps

artafinde is our new newest Junior DevOp[1] and will get access to:
* monitoring.al.org: for setting up gitlab-exporter[1]
* gitlab.al.org: for setting up gitlab-exporter[1]
* dashboards.al.org: in case he wants to do more monitoring related
  stuff

[1] https://lists.archlinux.org/pipermail/arch-devops/2022-May/000558.html
[2] https://gitlab.archlinux.org/artafinde/gitlab-exporter/

Ref #452