git-bug is great but it doesn't handle PRs nor does it have a method for users without commit rights to submit bugs to the project. I know they're working on the latter (something with the web UI?) but until then you still need some kind of public infra for issue management if you want the general public to be able to submit issues.

I use it for my project[0] to keep issues centralized with the repo, but I still use Github Discussions as a pseudo-bug tracker to let random users provide input. If it's a bug I add it to git-bug and sync it to Github issues for public viewing[1], but if you want use bug reports that's not really going to work.

[0] https://github.com/stryan/materia

[1] Ironically I got this workflow idea from ghostty and mise, both of which require users to submit bug reports as discussions first and only generate tagged issues once an actionable bug is determined.