feat(starling): script to run justfile

hosts/starling/default.nix

···
 in {
   imports = [
     "${self}/modules/darwin"
+    ./stars.nix
   ];
 
   networking = {

hosts/starling/stars.nix

···
+{
+  pkgs,
+  lib,
+  ...
+}: let
+  stars = pkgs.writeShellScriptBin "stars" ''
+    cd ~/Documents/git/flake
+    ${lib.getExe pkgs.just} starling
+  '';
+in {
+  environment.systemPackages = [stars];
+}