Cloudron Forum

Wow, thanks, that was fast! I'm not seeing the error any more.

As a first step, since user-mapping will likely not work with Cloudron SSO by just importing a database dump, install Gitea without Cloudron user-management, then try to import the database dump following the guide at https://docs.cloudron.io/guides/import-mysql/

Solved
This turned out to be easier than I expected, oops. I modified signin_inner.tmpl to only have the small OAuth2 portion of the signin page, i.e. I deleted lines 13-54 and 56-58 from that file (as it exists now), and put my version in gitea's folder custom/templates/user/auth/. As desired, it still displays "Login with cloudron", but not the main login option.