Infini-DL360: disable automatic gc

hosts/Infini-DL360/default.nix

@@ -63,6 +63,7 @@
   ];
 
   nix.settings.accept-flake-config = true;
+  nix.gc.automatic = false;
 
   networking = {
     firewall = {

modules/global/nix.nix

@@ -64,7 +64,7 @@ in
     };
 
     gc = {
-      automatic = true;
+      automatic = lib.mkDefault true;
       options = "--delete-older-than 7d";
       dates = "weekly";
     };