optimize APT usage

roles/docker/tasks/main.yml

@@ -6,14 +6,17 @@
       - gnupg
       - lsb-release
       - python3-pip
-    state: latest
-    update_cache: true
 - name: Add Docker APT key
   apt_key:
     url: https://download.docker.com/linux/ubuntu/gpg
 - name: Add Docker repository
   apt_repository:
     repo: "deb https://download.docker.com/linux/ubuntu {{ ansible_distribution_release }} stable"
+  register: apt_repository
+- name: Update APT cache
+  apt:
+    update_cache: true
+  when: apt_repository.changed
 - name: Install Docker packages
   apt:
     pkg:
@@ -21,8 +24,6 @@
       - docker-ce-cli
       - containerd.io
       - docker-compose-plugin
-    state: latest
-    update_cache: true
 - name: Install Docker modules for Python
   pip:
     name: