infra/roles/apps/tasks/prepare.yml

---
- name: "prepare {{ app.name }} environment on {{ inventory_hostname_short }}"
  set_fact: {"{{ item.key }}":"{{ item.value }}"}
  with_dict: "{{ app.vars }}"
  when: app.vars is defined

- name: "apply {{ app.name }} role on {{ inventory_hostname_short }}"
  include_role: name="{{app.name}}"
  when: inventory_hostname_short in app.binds