nixos/mailman: add http listener for uwsgi

With the config suggested in the module docs both Mailman core and
Hyperkitty are running, but Mailman core can not connect to Hyperkitty,
since the default hyperkitty.baseUrl is not set up by the module.

This adds a http listener to the uwsgi config and changes the default
hyperkitty.baseUrl to connect to this http listener.

nixos/modules/services/mail/mailman.nix

@@ -165,7 +165,7 @@ in {
 
         baseUrl = mkOption {
           type = types.str;
-          default = "http://localhost/hyperkitty/";
+          default = "http://localhost:18507/archives/";
           description = ''
             Where can Mailman connect to Hyperkitty's internal API, preferably on
             localhost?
@@ -391,6 +391,7 @@ in {
           plugins = ["python3"];
           home = pythonEnv;
           module = "mailman_web.wsgi";
+          http = "127.0.0.1:18507";
         };
         uwsgiConfigFile = pkgs.writeText "uwsgi-mailman.json" (builtins.toJSON uwsgiConfig);
       in {