Backup container for mariadb instances

This image provides a cron daemon that runs daily backups from mysql (clustered or single instance) to Google Storage.

Following ENV variables must be specified:

• MYSQL_HOST contains the remote host (hostname or IP) connection string for mysqldump command line client option -h
• mysql.domain.com
• MYSQL_PORT contains the remote port number for mysqldump option -P
• 3306
• MYSQL_PASSWORD password of user who has read access to all dbs.
• MYSQL_USER mysql user
• GS_URL contains address in GS where to store backups, without the gs:// url prefix
• bucket-name/directory