I use authentik. It’s probably fairly easy to set up if you use their docker-compose, but I run it as rootless podman, which took a little work to get it converted to a quadlet pod. But now that it’s set up, it works great and handles a variety of self-hosted apps that use saml, oidc, ldap, and forward-auth. It’s one of the few options that handles all the different authentication types natively. I also set up passkeys and standard two-factor time codes.

There are some very helpful authentik youtube tutorials by Cooptonian.