nixos/services: add gitea server

nixos/modules/nginx.nix

@@ -33,5 +33,9 @@ in
     #   root = "/var/www/myhost.org";
     #   default = true;
     # };
+
+    virtualHosts."git.${fqdn}" = mkVhost {
+      locations."/" = mkProxy config.services.gitea.settings.server.HTTP_PORT;
+    };
   };
 }