`oauth2-proxy` allow proxied authentication
I am currently using Azure AD as an OAuth provider but am aggregating my deployment's need for user authentication (including Coder and other apps) by authenticating once via oauth2-proxy. However, according to Coder docs, auth via proxy is not yet supported. I am not yet familiar with Coder's source code but am willing to pitch in to this as a feature. Is header-based or proxied auth already included in source? If not, does it already exist as a feature request?
