Oauth2_proxy with keycloak-oidc provider

I’m trying to setup oauth2_proxy with a keycloak-oidc provider. According to the oauth2_proxy documentation oauth2_proxy needs to be called with the option --oidc-issuer-url. But there is no configuration option for that in the service, even though keycloak-oidc is available as a provider option.

I suppose I can use oauth2_proxy.extraConfig, but I would have expected that the module provides all necessary options to make a provider work. Am I missing something?

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