according to the manual at https://salsa.debian.org/salsa-ci-team/pipeline/-/blob/master/README.md
If the pipeline is not yet enabled and configured in the gitlab web interface by default, this needs to be done manually as written in the manual.
As of now the salsa-ci only supports gbp, so convert the debrebase repository to a gbp one. Also work around a problem with gbp export-orig replacing variables in .gitarchive-info which then causes problems as the repository and the generated .tar.gz don't match.
Allow reprotest to fail for now as the build is currently not reproducible.
Disable blhc as xen currently does not enable hardening when building the hypervisor so blhc outputs many errors.