Extract docker cleanup stuff into its own role

ansible/roles/docker-cleanup/tasks/main.yml

@@ -0,0 +1,33 @@
+- name: Include docker variables
+  include_vars: docker.yml
+
+- name: Install docker-compose
+  apt:
+    name: docker-compose
+  become: true
+
+- name: Create docker user
+  user:
+    name: "{{ docker_user.name }}"
+    uid: "{{ docker_user.id }}"
+    group: "{{ docker_user.name }}"
+    create_home: false
+
+- name: Add user to docker user group
+  user:
+    name: "{{ user }}"
+    groups: "{{ docker_user.name }}"
+    append: true
+
+- name: Clean up docker containers
+  cron:
+    name: clean up docker containers
+    special_time: daily
+    job: docker system prune -af --volumes
+
+- name: Install util scripts
+  copy:
+    src: ./files/docker-utils
+    dest: "{{ home }}"
+    mode: 0755
+    directory_mode: 0755