---
- name: uninstall old docker versions
  package:
    name: ['docker', 'docker-engine', 'docker.io', 'containerd', 'runc']
    state: absent

- name: allow apt to use a repository over https (debian)
  package:
    name: ['apt-transport-https', 'ca-certificates', 'software-properties-common']
    update_cache: yes
  register: result
  until: result is succeeded

- name: add docker's gpg key
  apt_key:
    url: 'https://download.docker.com/linux/{{ ansible_distribution | lower }}/gpg'
  register: result
  until: result is succeeded

- name: add docker repository
  apt_repository:
    repo: "deb https://download.docker.com/linux/{{ ansible_distribution | lower}} {{ ansible_distribution_release }} stable"