Expire mysql binary logs out of the box

As reported in the bug, these can grow to 10s to 100s of GB
in a month. To reduce the chance of filling the disk and
bringing down the control plane this change defines
an expiry time.

Closes-Bug: 1720113
Change-Id: I508aad1f515d5108a3d08c90318b70d0a918908c

ansible/roles/mariadb/templates/galera.cnf.j2

@@ -15,6 +15,7 @@ log-error=/var/log/kolla/mariadb/mariadb.log
 
 log-bin=mysql-bin
 binlog_format=ROW
+expire_logs_days=14
 default-storage-engine=innodb
 innodb_autoinc_lock_mode=2
 

releasenotes/notes/expire-mariadb-bin-logs-c3df2b87460ca807.yaml

+---
+features:
+  - Automatically expire MariaDB binary logs after 14 days.