/usr/share/tripleo-image-elements/mysql-mariadb-compat/post-install.d/10-var-run-mysqld 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 5 6 7 | #!/bin/bash
set -eu
os-svc-daemon -n mariadb -u mysql -d mysqld
os-svc-enable -n mariadb-create-dir
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