Docker container - Mysql data not persistant

[mtchetch]

https://github.com/pglombardo/PasswordPusher/blob/8bbee221cf4e591bd03300b683957ad7d15c2131/containers/docker/pwpush-mysql/docker-compose.yaml#L14

The folder remains empty when using MysqlDB. The database is actually stored under /var/lib/mysql as per mariadb default configuration. The data will get wiped if the container is recreated with out the volume.