fix: ansible toolstack upgrade

Author: koenmtb1

ansible/ansible.cfg

@@ -3,7 +3,16 @@ inventory = inventory.ini
 roles_path = roles
 host_key_checking = False
 retry_files_enabled = False
-stdout_callback = yaml
+# `stdout_callback = yaml` resolved to the community.general.yaml plugin, which
+# was removed in community.general 12.0.0 — ansible-core superseded it with the
+# result_format option below in 2.13. The deploy workflow installs ansible
+# unpinned, so it started failing at startup the moment that release landed.
+stdout_callback = default
+# Note the key is `callback_result_format`, not `result_format` — the latter is
+# the option's name in ansible-doc but not its ini key, and ansible ignores
+# unknown ini keys silently, so the wrong one costs you the YAML output with no
+# error to explain why.
+callback_result_format = yaml
 
 [ssh_connection]
 pipelining = True