set default for docker_mirror.enabled to false, remove debug print

ansible/group_vars/all/oas.yml

@@ -33,3 +33,6 @@ krew:
 velero:
   version: "1.4.0"
   checksum: "sha256:1e8afc6631d36e9fabf618777e00705b7044ade1cab9b02953f237b777f46b91"
+
+docker_mirror:
+  enabled: false

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

@@ -95,10 +95,6 @@
 - name: Configure firewall
   import_tasks: firewall.yml
 
-- name: debug docker_mirror data
-  debug:
-    msg: Docker mirror is "{{ docker_mirror }}"
-
 - name: Write docker registries.yaml
   tags:
     - k3s