[Feat]: Authentik as OpenID Provider

[support-tt]

Is your feature request related to a problem? Please describe.
Authentik is a fast growing OpenID/SAML Provider that can also Proxy Traffic. I think it should be Supported by Lowcoder.
https://github.com/goauthentik/authentik
https://goauthentik.io/

Describe the solution you'd like
Because Authentik implementation auf OpenID is not much different from Keycloak the implementation should be not that hard. Unfortenetely im not a programmer but I can help with informations/testing etc.

Describe alternatives you've considered
Alternative is to have a generic Openid provider which supports all OpenID Providers.

Additional context
If Keycloak us used for the Syntax of the URL is:
https://KEYCLOAK.DOMAIN.DE/realms/REALMNAME/protocol/openid-connect/auth?response_type=code&client_id=CLIENDID&redirect_uri=LOWCODER_URL&scope=openid

With Authentik it is
https://AUTHENTIK.DOMAIN.DE/if/flow/FLOWNAME/?next=%2Fapplication%2Fo%2Fauthorize%2F%3Fscope%3Dopenid%2Bemail%2Bprofile%26response_type%3Dcode%26redirect_uri%3DLOWCODER_URL%26client_id%3dCLIENDID

[FalkWolsky]

We work and will soon publish on a generic OAuth Provider, where you can configure all these details, so also Authentik should be supported then.

[beatles1]

I was actually playing round with this and got Authentik working by adding some config to the Nginx reverse proxy infront of mine. I'm not actually sure if all of these locations are required but I had success with the below. It's very hacky and probably not ideal for production, do note this isn't very heavily tested but it seemed to work:

location /realms/lowcoder/.well-known/openid-configuration {
    proxy_pass https://<authentik-server>/application/o/lowcoder/.well-known/openid-configuration;
    proxy_set_header Host $host;
}
location /realms/lowcoder/protocol/openid-connect/auth {
    proxy_pass https://<authentik-server>/application/o/authorize/;
    proxy_set_header Host $host;
}
location /realms/lowcoder/protocol/openid-connect/userinfo {
    proxy_pass https://<authentik-server>/application/o/userinfo/;
    proxy_set_header Host $host;
    add_header content-type "application/json";
}
location /realms/lowcoder/protocol/openid-connect/token {
    default_type application/json;
    proxy_pass https://<authentik-server>/application/o/token/;
    proxy_set_header Host $host;
    add_header content-type "application/json";
}
location /realms/lowcoder/protocol/openid-connect/certs {
    default_type application/json;
    proxy_pass https://<authentik-server>/application/o/lowcoder/jwks/;
    proxy_set_header Host $host;
    add_header content-type "application/json";
}
location /realms/lowcoder {
    proxy_pass https://<authentik-server>/application/o/lowcoder/;
    proxy_set_header Host $host;
}

[FalkWolsky]

This should now work smooth with the new introduced generic OAuth Provider from v2.4.0 on.