[user module] add backup usr

Reviewed-on: #90

machines/nextcloud/configuration.nix

@@ -47,7 +47,7 @@ with lib;
     };
     extraAppsEnable = true;
     extraApps = {
-      inherit (config.services.nextcloud.package.packages.apps) contacts calendar deck polls;
+      inherit (config.services.nextcloud.package.packages.apps) contacts calendar deck polls registration;
       collectives = pkgs.fetchNextcloudApp {
         sha256 = "sha256-cj/8FhzxOACJaUEu0eG9r7iAQmnOG62yFHeyUICalFY=";
         url = "https://github.com/nextcloud/collectives/releases/download/v2.15.2/collectives-2.15.2.tar.gz";
@@ -56,6 +56,7 @@ with lib;
     };
     settings = {
       trusted_domains = ["10.0.0.13"];
+      trusted_proxies = [ "10.0.0.1" ];
       "maintenance_window_start" = "1";
       "default_phone_region" = "DE";
     };