OIDC Authentication

[supun-io]

On Cloud, Reader uses HYVOR authentication. For self-hosted instances, we rely on OIDC (Open Connect ID). The internal library can already handle most of this.

• Read https://github.com/hyvor/internal?tab=readme-ov-file#openid-connect-setup
• See also Relay's PR: OIDC relay#159

Then,

• Set up OIDC
• Test with OIDC (a free Auth0 account can be used for testing)