Starting with ansible-core 2.13, list concatenation format is changed
and does not support concatenation operations outside of the jinja template.
The format change:
"[1] + {{ [2] }}" -> "{{ [1] + [2] }}"
This affects the horizon role that iterates over existing policy files to
override and concatenate them into a single variable.
Co-Authored-By: Dr. Jens Harbott <harbott@osism.tech>
Closes-Bug: #2045660
Change-Id: I91a2101ff26cb8568f4615b4cdca52dcf09e6978
97cd173177