Interesting, but explain to me how your product is going to get me more than just using this: pagekite.net. I've used it to share features with my collaborators quite often (and especially with my UI/UX designer, quality-assurance people, etc. for front-end work) to make sure that I'm going in the right direction as I work. It essentially allows me to forward external traffic to my localhost, on which a dev server is running the code from my branch. No dockerfiles, no branches.
Interesting. How is this better than just sharing the Dockerfile directly? Or just having a free instance hosted on Heroku? It's not too hard to load a container. As an example <a href="https://github.com/discourse/discourse_docker" rel="nofollow">https://github.com/discourse/discourse_docker</a> makes it pretty straight forward to host discourse.
This is awesome. Many times I have looked at an open source project and wanted to look around but didn't want to take the time to download, setup, etc. This looks awesome!