This worries me, i can see the new owners killing the Community edition and/or enshittifying the software to uselessness. Do we have a FOSS alternative that does the whole CI/CD pipeline too?
SourceHut is worth checking out. It leans towards minimal aesthetics, but is actually very functional. Granted, the workflow is quite different than other VCS providers, but you may grow into it, like I have :)
It doesn't work with Resist Fingerprinting mode (which hides OS settings), and doesn't have a manual toggle that I can see, but does now have a @media(prefers-color-scheme:dark) clause in its CSS. That's a step in the right direction. :)