add enabled flag for docker_mirror setting

ansible/group_vars/all/settings.yml.example

@@ -12,7 +12,8 @@ admin_email: "admin@example.com"
 acme_staging: false
 
 # It is possible to add a docker mirror that serves images from docker.io.
-docker_mirror: {}
+docker_mirror:
+  enabled: false
   # endpoint: URL of docker mirror
   # username: username for auth
   # password: password for auth

ansible/roles/pre-configure/tasks/main.yml

@@ -116,4 +116,4 @@
     src: registries.yaml
     dest: /etc/rancher/k3s/registries.yaml
     mode: '0740'
-  when: docker_mirror is not empty
+  when: docker_mirror.enabled

openappstack/cluster.py

@@ -177,6 +177,7 @@ class Cluster:
         if self.docker_mirror_endpoint \
                 and self.docker_mirror_username \
                 and self.docker_mirror_password:
+            settings['docker_mirror']['enabled'] = True
             settings['docker_mirror']['endpoint'] = self.docker_mirror_endpoint
             settings['docker_mirror']['username'] = self.docker_mirror_username
             settings['docker_mirror']['password'] = self.docker_mirror_password