Feature Description

Hi!

I saw it's possible to authenticate using a reverse proxy by sending an X-Webauth-User header. Optionally (if enabled in settings), if the X-Webauth-Email header is provided a user is also auto-registered.

For my internal setup at home, my reverse proxy does not have access to gitea usernames, but the sign in system has access to emails. Would it be possible to extend the code to allow authenticating just via the contents of X-Webauth-Email?

I'm happy to try and put up a PR myself if there are no objections to this feature.

Screenshots

No response