add zig installation via tarball

vars/main.yml

@@ -3,7 +3,7 @@
 assume_missing_is_syspkg: true
 full_upgrade: false
 install_state: present
-default_confg:
+default_config:
   install_prefix: /usr/local
   become: true
   owner: root
@@ -33,6 +33,7 @@ pkgconfig:
   go: {}
   hashicorp: {}
   kitty: {}
+  ghostty: {}
   neovide: {}
   neovim: {}
   nerdfonts: {}