Event Store cluster in rancher

Info:

Best practice is to create a cluster of 3 nodes, but for this, you'll need at least 3 machines on your rancher cluster since the same external host port is used for each EventStore container.

This template is not maintained by the EventStore team (https://geteventstore.com/) so do not buzz Greg Y. If it's not working, blame to commiter of this lines : Jérôme Rx, and make a pull request to improve this template.