build04, modules/darwin/common: set nixCommunity.gc.gbFree to 25

hosts/build04/configuration.nix

@@ -9,6 +9,8 @@
     inputs.self.nixosModules.remote-builder
   ];
 
+  nixCommunity.gc.gbFree = 25;
+
   # disable kvm/nixos-tests
   nix.settings.system-features = [ "big-parallel" ];
 

modules/darwin/common/default.nix

@@ -21,6 +21,8 @@
     ];
   };
 
+  nixCommunity.gc.gbFree = 25;
+
   services.nix-daemon.enable = true;
 
   programs.zsh.enable = true;