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.
Linux DEB and RPM system packages for build.gimp.org Jenkins.
This is to support an immutable infrastructure model of Jenkins for the GIMP project. When installing Jenkins, it typically only installs the latest version of the WAR and the latest version of all of the plugins. This makes reliably reproducing issues difficult. Jenkins publishes artifacts to a Maven repository. This project is designed to download the exact version of the Jenkins WAR as well as exact versions of all of the Jenkins plugins. This makes configuring and testing upgrades more reliable.
See packaging README.