chore: set formatted Ansible output

ansible.cfg

@@ -26,6 +26,8 @@ nocows = 1
 # user checks them out.
 roles_path = ../:~/.ansible/roles:/usr/share/ansible/roles:/etc/ansible/roles
 
+callback_whitelist: yaml
+
 [inventory]
 # Ignore these extensions when parsing a directory as inventory source.
 ignore_extensions = .pyc, .pyo, .swp, .bak, ~, .rpm, .md, .txt, ~, .orig, .ini, .cfg, .retry