`boutpp-nightly` CI job fails to upload

[ZedThree]

ERROR    HTTPError: 400 Bad Request from https://upload.pypi.org/legacy/        
         Filename 'boutpp_nightly-v5.2.1.dev169.tar.gz' is invalid, should be   
         'boutpp_nightly-5.2.1.dev169.tar.gz'.

[ZedThree]

I'm not sure we really want to be uploading a new version on every pull into next either!

[dschwoerer]

Yes, we probably can remove that again. I thought it might be useful, because we release so infrequently, but I think at least for testing containers are much nicer, so we probably do not need to upload them to pypi.org.

However, that bug really should be fixed, because otherwise we will have an issue on the next release.