/usr/share/tripleo-image-elements/apache2/post-install.d/15-apache2 is in python-tripleo-image-elements 0.7.1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/bash
set -eux
os-svc-enable -n apache2
|