Not so much but it's an old architecture that dates back before docker/container techs came around, so it's kind of a pain. We're looking into a better architecture that would allow us to add any language in a couple hours
You're the third person to ask for this on this HN post :) I'll just copy-paste my answer now
We have a lot on our plates right now so adding new languages isn't the main priority, however we add languages based on the number of upvotes on suggestions in our dedicated forum thread
My question was aimed at OpenAI Gym (which seems to be using Docker), but since you seeem to be involved with CodinGame, I kindly ask you to please add support for Common Lisp ;).
I've not used it yet but I hope to soon!