Hey Stephan,
Currently, we do not have a repo dedicated to client packages, but an RFC was written to add one. Please see Introduce a Foreman Client Repository.
I don’t think there will be any objections, so the @packaging team can set up a repo.
Packaging generally lives in the foreman-packaging repo. The readme of the rpm/develop branch contains some info what is needed for packaging. Especially @ekohl, who you know from the conference as well, has a good background in both packaging and python and can probably help with the effort.
Timo