add py{27,3}-from-forge to clients project to ensure we don't break everything when releasing
Right now we've have broken francearchives by releasing too fast, it would be great to add "from-forge" tests in the client projects .gitlab-ci.yaml like on our core projects, for example:
I'm putting this on 3.28 because it would be great to have it but I don't think it's blocking.
Also I don't have access to enough client projects to do this by myself but I'm know it's a WIP on francearchives for example.