Oauth2 generated accounts are not added as creators

[poVoq]

Describe the bug On a selfhosted instance that only allows Oauth2 logins and users get the role contributor automatically, there are no premade creators for these users but when they try to create one with the same name Manyfold says the username is already taken.

To Reproduce Steps to reproduce the behavior:

1. Login as an Oauth2 created user
2. Try to upload model, but there is no creator of the same name
3. Try adding a creator of the same name
4. See error that the name is already taken.

Expected behavior There should be automatically a creator for each account with the contributor role that gets auto-selected when uploading a model.

Additional context Self hosted instance using official docker container setup.

[Floppy]

Good spot, thank you.