change to visibility parameter

Author: scrungus

examples/templates/images.j2

@@ -7,7 +7,7 @@
   name: "{{ item.value.name }}"
   type: qcow2
   image_url: "{{ item.value.url }}"
-  is_public: True
+  visibility: "community"
   properties:
     os_distro: "ubuntu"
     os_version: "20.04"