[fanny] add disable autoupdate option at startup

machines/fanny/configuration.nix

@@ -1,4 +1,4 @@
-{ inputs, config, ... }:
+{ inputs, config, lib, ... }:
 let
   sshKeys = import ../ssh_keys.nix;
   peers = import ../modules/malobeo/peers.nix;
@@ -47,6 +47,10 @@ in
     jobset = "infrastructure";
     cacheurl = "https://cache.dynamicdiscord.de";
   };
+  specialisation."NOAUTOUPDATE".configuration = {
+    system.nixos.tags = [ "NOAUTOUPDATE" ];
+    malobeo.autoUpdate.enable = lib.mkForce false;
+  };
 
   malobeo.backup = {
     enable = true;