add nix settings and dir colors for MacOS

system/macos/environment.nix

@@ -2,4 +2,11 @@
 {
   # Manage /etc/shells and place add nix version of bash
   environment.shells = [ pkgs.bash ];
+
+  # Enable ls colors
+  environment.variables = {
+    CLICOLOR = "1";
+    LSCOLORS = "ExFxBxDxCxegedabagacad";
+  };
+  environment.shellAliases.ls = "ls --color";
 }

system/macos/nix.nix

@@ -0,0 +1,6 @@
+{ config, lib, ... }:
+{
+  nix.settings = {
+    trusted-users = lib.mkForce [ "@admin" "${config.system.primaryUser}" ];
+  };
+}