Add Keycloak to the enabled services list and update its configuration to include the HTTP host setting

modules/servers/keycloak.nix

@@ -32,6 +32,7 @@ in
         hostname-strict-https = false;
         http-enabled = true;
         http-port = cfg.port;
+        http-host = cfg.ip;
         proxy-headers = "xforwarded";
       };
     };