Add auto-update

* for all hosts, use debops.unattended_upgrades
* for docker compose, install a cron job pulling new images and restarting affected containers

playbooks/roles/docker_compose/tasks/main.yaml

@@ -97,3 +97,11 @@
 #     msg: "If this reports changed, then the docker compose containers changed."
 #   changed_when: (docker_compose__ps_json_before_up.stdout | from_json | community.general.json_query('[].ID') | sort)
 #                 != (docker_compose__ps_json_after_up.stdout | from_json | community.general.json_query('[].ID') | sort)
+
+- name: Install automatic update cron job
+  become: true
+  ansible.builtin.cron:
+    name: 'docker compose auto update'
+    minute: "0"
+    hour: "5"
+    job: "cd /ansible_docker_compose; docker compose pull && docker compose up -d"