feature request: allow to disable registration

[hengheng0haha]

What problem did you meet?

My app doesn't require registration, is there a configuration to disable registration?

Describe what you'd like Logto to have

Disable registration via environment variables such as REGISTRATION_DISABLE=1.
Once disabled, it is hoped that users can still be added in the admin console.

[gao-sun]

thanks, it's valid. we'll figure out this.

[gao-sun]

i'm adding Q3 label for now since this looks not too much work. the timeline may change though

[gao-sun]

the PR has been merged, you can use TAG=edge to fetch to main branch image, or wait for the next release.

then go Admin Console -> Sign-in Experience -> Tab "Others"-> Authentication, and you'll see a switch to disable registration.

feel free to let us know if you have any questions. :-)