---
- name: Ensure depdencies are installed.
  apt:
    name: "{{ item }}"
    state: present
  with_items:
    - apt-transport-https
    - ca-certificates

- name: Add Docker apt key.
  apt_key:
    url: https://apt.dockerproject.org/gpg
    id: 58118E89F3A912897C070ADBF76221572C52609D
    state: present

- name: Add Docker repository.
  apt_repository:
    repo: "{{ docker_apt_repository }}"
    state: present
    update_cache: yes