Generic openid connect configuration

[wayneconnolly]

Hi all,

I use selfhosted Authentik (https://auth.domain.tld) as my IDP and have it working with wordpress, gitea and portainer.

• https://docs.goauthentik.io/integrations/services/wordpress/

I would like to see if hasura-auth is able to use a custom domain OpenID Identity Provider to register and authorise users.

I'm happy to attempt a PR if I can get some direction.

[wayneconnolly]

I created a PR on grant: https://github.com/simov/grant/pull/301/commits/5aa29c219c528f08ba3a88e382168c9e0259996d