It would be nice if there was a official docker hub repo so we can deploy with tools like http://tutum.co I realize this was discussed awhile back but this continues to be a disadvantage for those of us wanted to use cloud orchestration tools like Tutum.
The situation since the last discussion hasn’t changed. Deploying discourse involves custom-building a Docker image specifically configured for the site that’s being served. That means that a generic docker hub image isn’t possible. If you want to help change the situation, I’d recommend getting in touch with the people who talked about getting this done and contribute to that work.