Copy over some initial stuff

roles/docker/tasks/main.yml

@@ -0,0 +1,53 @@
+---
+- name: Ensure older Docker versions aren't installed.
+  apt:
+    name:
+      - docker
+      - docker-engine
+      - docker.io
+      - containerd
+      - runc
+    state: absent
+
+- name: Install Docker PPA dependencies.
+  apt:
+    name:
+      - apt-transport-https
+      - ca-certificates
+      - gnupg
+      - lsb-release
+    state: present
+
+- name: Add Docker GPG key.
+  apt_key:
+    url: https://download.docker.com/linux/ubuntu/gpg
+    state: present
+
+- name: Add Docker PPA.
+  apt_repository:
+    # https://gist.github.com/rbq/886587980894e98b23d0eee2a1d84933
+    repo: deb [arch=amd64] https://download.docker.com/{{ ansible_system | lower }}/{{ ansible_distribution | lower }} {{ ansible_distribution_release }} stable
+    state: present
+
+- name: Install Docker, docker-compose & cron.
+  apt:
+    name:
+      - docker-ce
+      - docker-ce-cli
+      - containerd.io
+      - docker-compose
+      - cron
+    state: present
+
+- name: Ensure Docker is running & enabled.
+  service:
+    name: docker
+    state: started
+    enabled: true
+
+- name: Add Docker prune cronjob.
+  cron:
+    name: Prune the Docker system.
+    hour: 4
+    minute: 0
+    job: docker system prune -f