After experimenting with a self-hosted GitLab instance for a few weeks, I have decided to give up on it and opt for a much lighter solution. GitLab is extremely comprehensive and powerful, but it’s also a massive bloated system. Furthermore, I wasn’t particularly happy with the idea of having a CI runner on a dedicated machine at home. A robust and secure solution for macOS and iOS development requires running CI tasks in isolation in a virtual machine (using Tart, for example). This represents quite an effort in setup and maintenance.
After some research, it appears that the 2 software forge that seem interesting today are Gitea, to which Blender migrated, and its fork Forgejo, born after Gitea switched to a model where a company oversees the project.
Both solutions are very similar, but the non-commercial aspect and the fact that the Codeberg platform is based on Forgejo pushed me to choose this latter solution to host my software projects.

You will therefore now find Shoofler at the address https://forgejo.michelon.ch/michelon/Shoofler.
Forgejo offers all the basic features expected from a code hosting solution (branch rules, pull request, issue tracker, wiki, …) in a very light package. And as it is intended only for my personal use, I’m using SQLite as the database backend, making the system even faster.