Install Docker CE on Ubuntu using Ansible

docker.yml

---
- hosts: all
  tasks:
  - name:    Install prerequisites
    apt:     name={{item}} update_cache=yes
    with_items:
     - apt-transport-https
     - ca-certificates
     - curl
     - software-properties-common
  - name:    Add Docker GPG key
    apt_key: url=https://download.docker.com/linux/ubuntu/gpg
  - name:    Add Docker APT repository
    apt_repository:
      repo: deb [arch=amd64] https://download.docker.com/linux/ubuntu {{ansible_distribution_release}} stable
  - name:    Install Docker
    apt:     name=docker-ce