Keycloak OIDC

[TheDarkula]

First off, thank you so much for your work!

I am trying to configure cozy-stack with Keycloak.

Looking at the OIDC documentation, I have this block:

  authentication:
    keycloak:
      disable_password_authentication: true
      oidc:
        client_id: cozy
        client_secret: secret-goes-here
        scope: openid profile
        login_domain: cozy.domain.com
        redirect_uri: https://cozy.domain.com/oidc/redirect
        authorize_url: https://auth.domain.com/realms/realmname/protocol/openid-connect/auth
        token_url: https://auth.domain.com/realms/realmname/protocol/openid-connect/token
        userinfo_url: https://auth.domain.com/realms/realmname/protocol/openid-connect/userinfo
        userinfo_instance_field: preferred_username
        allow_custom_instance: false
        allow_oauth_token: false
        id_token_jwk_url: https://auth.domain.com/realms/realmname/protocol/openid-connect/certs

I understand that cozy allows multi-tenancy/multiple instances in one server.
I only intend on running one domain.
Is there a way to bypass the userinfo_instance_field setting so I just point to cozy.domain.com instead of a numbered setup?