Support Authelia OIDC

[dlford]

Goals

1. Add support Authelia as an authentication provider

Non-Goals

No response

Background

Currently Authelia may work as a generic OIDC provider, there is one stale issue that was never addressed (#7990).

Ultimately, I want Authelia supported explicitly as I want to use it with LinkWarden, which is utilizing Next-Auth but not providing the option for a generic provider.

Proposal

I am willing to contribute to this feature.

[LarssonOliver]

I'd also be very happy to see explicit support for Authelia!

[dlford]

Just an update; I've been quite busy lately, if anybody wants to pick this up they are welcome to, if not I'll eventually get some time to take a crack at it.