Ability to define GPG key path for Docker APT (#10513)

roles/container-engine/docker/tasks/main.yml

@@ -57,6 +57,7 @@
   apt_key:
     id: "{{ item }}"
     url: "{{ docker_repo_key_info.url }}"
+    keyring: "{{ docker_repo_key_keyring|default(omit) }}"
     state: present
   register: keyserver_task_result
   until: keyserver_task_result is succeeded