---
- name: Ensure the container-image-builders group exists
  hosts: localhost
  gather_facts: False
  tasks:
    - name: Ensure the container-image-builders group exists
      fail:
        msg: >
          Container images are now built by hosts in the
          container-image-builders group. Ensure that this group is present in
          your inventory.
      when: groups.get('container-image-builders', []) | length == 0