review need of redirect_url_scheme

[migmartri]

There is a custom option set in the controlplane called redirect_url_scheme that we should double check if it can be inferred automatically instead.

This option is used to indicate the oidc callback what schema to use, and it's configured in the config files under the auth.oidc section. This option is yet another nob that will need to be tweaked by the user during deployment and we should look into simplifying it.