Update oauth2-proxy configuration to use dynamic Keycloak URL and enhance redirect settings

modules/servers/oauth2-proxy.nix

@@ -23,8 +23,7 @@ in
       provider = "keycloak-oidc";
       clientID = "oauth2-proxy";
       keyFile = config.sops.secrets.oauth2-proxy.path;
-      oidcIssuerUrl = "https://auth.lebubu.org/realms/homelab";
-      redirectURL = "https://auth-proxy.lebubu.org/oauth2/callback";
+      oidcIssuerUrl = "${config.my.servers.keycloak.url}/realms/homelab";
       httpAddress = "${cfg.ip}:${toString cfg.port}";
       email.domains = [ "*" ];
       cookie = {
@@ -45,6 +44,8 @@ in
         session-store-type = "cookie";
         skip-provider-button = true;
         code-challenge-method = "S256";
+        redirect-url = "${cfg.url}/oauth2/callback";
+        whitelist-domain = [ ".lebubu.org" ];
       };
     };
   };