Hi @it33,
I used a Cubietruck (more or less a raspberry with SATA) and tried to use this as my own single server. Just for evaluation. Didn't had in mind that this is not a x64 platform as I'm testing a lot of things on it.
Buy the way....zulip is running very good on it 
I'm just testing mattermost on AWS but don't get it to run....fourth time installing it but always get the feedback "No Docker image specified in either Dockerfile or Dockerrun.aws.json. Abort deployment."
Using dockerrun.aws.json V1.3