
This PR allows users to select MariaDB versions. The original problem is that Trove fails to create backup of MariaDB- -10.7 instances because Trove's backup script is from MariaDB-10.4[1], which is generally incompatible with MariaDB-10.7[2]. 1: https://opendev.org/openstack/trove/src/branch/master/backup/install.sh#L26 2: https://mariadb.com/kb/en/mariabackup-overview/#compatibility-of-mariabackup-releases-with-mariadb-server-releases Story: 2010566 Task: 47275 Change-Id: I03e6b58a7b1746fef8c08d92acd7b1ccac9a46eb