I'm very interested to learn more about this class of tool. I had seen[0] Coder including alpha support for .devcontainer, but I'm not aware of other OSS options. 0. https://coder.com/docs/v2/latest/templates/devcontainers#dev...
The main downside I can see is that users have to write their workspaces for a particular deployment target. This would be a problem for e.x. open source projects trying to check in a workspace definition file of some kind. We standardize on Kubernetes across clouds and bare metal so it's not an issue for us, but it makes sense that it would be an issue for other use cases.