Add cron job to prune unused Docker data

roles/docker_services/tasks/config.yml

@@ -8,5 +8,11 @@
     mode: u=rw,g=r,o=r
   notify: reload-dockerd
 
-- name: Flush handlers
-  ansible.builtin.meta: flush_handlers
+- name: Configure cron job to prune unused Docker data weekly
+  ansible.builtin.cron:
+    name: Prune unused Docker data
+    cron_file: ansible_docker_prune
+    job: 'docker system prune -fa && docker volume prune -fa'
+    special_time: weekly
+    user: root
+    state: present

roles/docker_services/tasks/main.yml

@@ -8,7 +8,7 @@
 
 - name: Add Docker apt repository
   ansible.builtin.apt_repository:
-    repo: deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian bullseye stable
+    repo: 'deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian bullseye stable'
     state: present
     update_cache: true
 
@@ -39,6 +39,11 @@
 
 - name: Configure Docker
   ansible.builtin.import_tasks: config.yml
+  tags:
+    - docker_config
+
+- name: Flush handlers
+  ansible.builtin.meta: flush_handlers
 
 - name: Set up Docker services
   ansible.builtin.import_tasks: services.yml