Bbut if you click register and try to register, one cannot login without an invite code.
Ah, I see. I just tested this and you are correct. That is good enough!
I do still have these two extra "blank" users (one admin and one not) that I cannot figure out how to get rid of and cannot edit (I tried to set them to Inactive, but the Save button doesn't appear to do anything), but I also cannot login as them, so I think it's okay. (These users are only in wekan, not in cloudron. My cloudron users are just the ones I expect to see.)
Thanks for the help, and for the update to the docs. You are doing wonderful work trying to make self-hosting feasible for folks willing to try.
I haven't tried anything OAuth related with Wekan, so I don't really know. Generally once we publish a package without cloudron user management, we will just take whatever Wekan is providing for settings, hopefully a GUI then.