Broken Archlinux CI
@Salamandar Our Archlinux CI got broken.
It was complaining about corrupted packages when installing dependencies (see for instance: https://gitlab.gnome.org/GNOME/gimp/-/jobs/541144). I'm not sure if that were because of the fact you implemented a custom image (then was that custom packages?) or if the issue was coming from upstream Archlinux. Anyway I decided to port the CI to Debian testing, which I wanted to do for a long time for the simple reason that this OS is officially our base for development (all our dependency choices depend on Debian testing).
Now I am not against the Archlinux CI, hence this bug report to say so, so that you don't discover that your CI build has been changed and be disappointed. If you feel there is any usefulness to also have a CI build based off Archlinux, you can bring it back (side by side to the Debian testing one), after fixing what was broken. Not sure if this brings us a lot, but maybe.
Otherwise let's just close this report.