I just posted a Show HN for docker-run[1]. It can be used to implement the code running part for a project like this.

[1] https://news.ycombinator.com/item?id=25602894

No, I don't have plans to open source it currently. I am not sure where open source will take this project to and the source code is a bit messy. I may write about how I built it in the future.