This project has been migrated to GNOME GitLab under World/gimp-ci. Refer to the documentation repository for better information. If you just want to build GIMP, then check out the GIMP development environment based on Docker. The Docker environment also allows you to run GIMP if you have Xorg display; instructions therein.
Misc scripts which don't fit into any particular category. These scripts are used in one place or another to maintain the GIMP CI system.