gistfile1.txt

---
- hosts: localhost
  include: myvars.yml
  pre_tasks:
    - debug: var=num_servers_to_provision
  roles:
    - {role: provision}

gistfile2.yml

- vars_files:
  # Todo: Find a way of putting this in another file and including it. Otherwise we'll be repeating it all over the place.
  - ["inventory/group_vars/{{ env_name | mandatory }}.yml", "inventory/group_vars/empty.yml"]
  - ["inventory/group_vars/{{ env_name | mandatory }}-{{ app_name }}.yml", "inventory/group_vars/empty.yml"]
  - ["inventory/group_vars/{{ env_name | mandatory }}-{{ app_name }}-{{ role_name }}.yml", "inventory/group_vars/empty.yml"]