Use handlers

tasks/docker.yml

@@ -18,7 +18,7 @@
   loop:
     - { src: 'files/docker/apt.gpg', dest: '/etc/apt/keyrings/docker.gpg' }
     - { src: 'files/docker/config.json', dest: '/etc/docker/daemon.json' }
-  register: docker_config
+  notify: restart docker service
 
 - name: 'install docker apt source'
   become: true
@@ -36,12 +36,4 @@
       - docker-ce-cli
       - containerd.io
       - docker-compose-plugin
-  register: docker_install
-
-- name: restart docker service
-  become: true
-  systemd:
-    name: docker.service
-    state: restarted
-    enabled: true
-  when: docker_config.changed or docker_install.changed
+  notify: restart docker service