Multiple MySQL databases backup for Docker

This lightweight (alpine-based) image can:

• Make backup of multiple MySQL databases
• Compress each .sql dump with GunZIP using pigz
• Store previous dumps for a $RETENTION_PERIOD

Environment variables (with default values)

• PROFILES="USER:PASS@HOST:PORT USER@HOST/DATABASE ..." (required)
• RETENTION_PERIOD=7
• MYSQLDUMP_OPTIONS="--lock-tables"