Docker in sandboxes
A sandbox is a full virtual machine with its own kernel, so it is a natural place to run the Docker engine and containers next to an agent.
Coming soon
A fully working Docker integration in sandboxes: run the Docker engine and your containers inside a sandbox.
Until then, if you need a container image as the environment of a sandbox, use it as a base: pull it from a registry or build it from a Dockerfile on the workspace, see Images.