> Gitlab supposedly is Google-backed, so I don't want to have my private code there.
This strikes me as odd. May I ask why usage of GCP is a deal-breaker for you? While I can understand not wanting to use Google products directly as a consumer, I believe it would be - for lack of a better term - platform suicide for Google to intercept and perform its usual analytical shenanigans on the data content of transmissions to/from their platform.
Either way, Phacility's Phabricator[1] is $20/user/mo.