Kubernetes Gitlab x keycloak - how to configure gitlab.rb?

I am trying to configure keycloak authentication in our gitlab ( installed under kubernetes ).
I could not find a documentation or a way to configure the provider, certificate, etc under gitlab, the documentation says you should change the gitlab.rb file, but how to do this under kubernetes ?
Also, there is any documentation on how to configure keycloak saml in kubernetes gitlab ?

Hiya @IceBergy , Hope you are doing well. Were you able to configure keycloak on Kubernetes Gitlab?

Kind Regards,