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.