Refactor Docker installation playbook: remove unnecessary register, add flush_handlers task, and correct comment capitalization

playbooks/install-standard-docker.yml

@@ -27,7 +27,6 @@
         url: https://download.docker.com/linux/ubuntu/gpg
         dest: "{{ docker_keyring_path }}"
         mode: "0644"
-      register: docker_key_download
 
     - name: Add Docker repository to Apt sources
       copy:
@@ -36,6 +35,9 @@
           deb [arch={{ ansible_architecture }} signed-by={{ docker_keyring_path }}] https://download.docker.com/linux/ubuntu {{ ansible_lsb.codename }} stable
       notify: Update apt cache
 
+    - name: Flush handlers to update apt cache before installing Docker
+      meta: flush_handlers
+
     - name: Install Docker packages
       apt:
         name:
@@ -45,7 +47,7 @@
           - docker-buildx-plugin
           - docker-compose-plugin
         state: present
-        update_cache: no # already handled by handler
+        update_cache: no # Already handled
 
   handlers:
     - name: Update apt cache