OIDC Support for auth

[fabioteixei]

Hello

I'm forced to use Ombi even if i found it realy lacking if we compare with Overseerr, but i have no choice becouse Overseerr only supports local accounts or Plex accounts to log in, what makes it impossible to use with some kind of IDP like Authelia or Authentik.

We all know how users are, they are not tech savy, they dont know how to use many differents users for different services and etc. I dont want to ask my users to create an plex account to connect to overseerr or even remember a diferrent username/password.

On my setup all my users are already authenticated using Azure AD, and because of this i can use Authentik to SSO to all my apps, but because it not works on Overseerr they need to double log on to access Overseerr.

You have a pull request that can fix this issue waiting since last year. #2792

Can you please check if you can aprove this an allow us to use OIDC to SSO?