added substitution for apikey

roles/arch-boxes/tasks/main.yml

@@ -9,6 +9,9 @@
 - name: clone arch-boxes repository
   git: repo='https://github.com/archlinux/arch-boxes.git' dest="{{ archboxes_dir }}" force=yes
 
+- name: replace placeholder to vagrantcloud API Key
+  replace: path="{{ archboxes_dir }}/arch-boxes/vagrant.json" regexp='PLACEHOLDER' replace="{{ archboxes.apikey }}"
+
 - name: install arch-boxes service
   template: src='arch-boxes.service.j2' dest='/etc/systemd/system/arch-boxes.service' owner=root group=root mode=0644
   notify: