Backup container for rabbitmq instances

This image provides a cron daemon that runs daily backups from rabbitmq to Amazon S3.

Following ENV variables must be specified:

• RABBITMQ_ERLANG_COOKIE contains the secret connection string for rabbitmqctl remote management (both RabbitMQ containers should have the same cookie string set)
• RABBITMQ_HOSTNAME contains the hostname (also referred as "Node name") string for rabbitmqctl remote management (option -n)
• S3_URL contains address in S3 where to store backups
• bucket-name/directory
• S3_ACCESS_KEY
• S3_SECRET_KEY
• CRON_SCHEDULE cron schedule string, default '0 2 * * *'