We can and should start that work, let's just not do it with rails 7 in unstable before the existing transitions are done with. I'm looking into the rails 7 `newapp` autopkgtest and I think I made it work.
With ruby-useragent added as dependency to ruby-actionpack, the regressions reduced significantly.
Now 13 more regressions we need to check, 14 identified as
something we need to fix (out of this 4 are unused dependencies
that can be removed from gitlab/rails), 6 we can just request
removal from testing, 2 possibly fixed upstream