disable binfmt emulation on my build machines

hosts/by-name/desko/default.nix

@@ -9,6 +9,9 @@
   # services.distccd.enable = true;
   # sane.programs.distcc.enableFor.user.guest = true;
 
+  # TODO: remove emulation, but need to fix nixos-rebuild to moby for that.
+  # sane.roles.build-machine.emulation = true;
+
   sops.secrets.colin-passwd.neededForUsers = true;
 
   sane.ports.openFirewall = true;  # for e.g. nix-serve

hosts/by-name/servo/default.nix

@@ -15,7 +15,6 @@
   };
 
   sane.roles.build-machine.enable = true;
-  sane.roles.build-machine.emulation = false;
   sane.zsh.showDeadlines = false;  # ~/knowledge doesn't always exist
   sane.programs.consoleUtils.suggestedPrograms = [
     "pcConsoleUtils"

hosts/modules/roles/build-machine.nix

@@ -13,7 +13,7 @@ in
     };
     emulation = mkOption {
       type = types.bool;
-      default = true;
+      default = false;
     };
     ccache = mkOption {
       type = types.bool;