Is your feature request related to a problem? Please describe.
using an external user system for password and permission management

Describe the solution you'd like
Using og Oauth2 with OIDC

Describe alternatives you've considered
if you want to be worse, maybe LDAP

Additional context
Mailu has the same issue: Mailu/Mailu#2575

Somebody has an PR / Fork:

• a Fork: https://github.com/heviat/Mailu-OpenID/
• a PR: Add external OpenID connect support Mailu/Mailu#2574