Moved ansible stuff to own folder

ansible/roles/docker/files/daemon.json

@@ -0,0 +1,6 @@
+{
+    "metrics-addr" : "0.0.0.0:9323",
+    "experimental" : true,
+    "mtu": 1450,
+    "network-control-plane-mtu": 1450
+}

ansible/roles/docker/handlers/main.yml

@@ -0,0 +1,5 @@
+---
+- name: restart docker
+  service:
+    name: docker
+    state: restarted

ansible/roles/docker/tasks/main.yml

@@ -0,0 +1,69 @@
+---
+- 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={{ ansible_architecture | replace('aarch64', 'arm64') | replace('x86_64', 'amd64') }}] https://download.docker.com/{{ ansible_system | lower }}/{{ ansible_distribution | lower }} {{ ansible_distribution_release }} stable"
+    state: present
+
+- name: Install Docker, docker-compose & cron.
+  apt:
+    update_cache: yes
+    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 -af
+
+- name: Add debian user to docker group.
+  user:
+    name: debian
+    groups: docker
+    append: true
+
+- name: Enable metric endpoint for Prometheus
+  copy:
+    src: daemon.json
+    dest: /etc/docker/daemon.json
+    owner: root
+    group: root
+    mode: '644'
+  notify: restart docker