Feature Request: How can I use my own image

[jlia0]

It would be cool to run our own image (dockerfile) when starting a new sandbox

[suhjohn]

+1

or if there's a way to "bake" some sort of startup version. I think a way to enable this would be to support "copy" from a checkpoint (aka. if I can just have a .sh that sets up a canonical sprite to a certain state, then do something like "create new from checkpoint", it effectively functions as a "FROM")