Debian customizes CI tooling with GitLab

Debian has implemented Salsa CI, a custom CI tool built on GitLab, to automate package testing before release. This tool emulates the Debian build process, running 17 different jobs including builds on multiple architectures and autopkgtest suites, significantly reducing the time to identify regressions from hours/days to minutes. This improves the reliability of package migration from Debian Unstable to Testing and reduces manual rework for maintainers.