`docker-outside-of-docker`: Add support for containerd image store

[esthezia]

Hi!

For the Docker outside of Docker devcontainer feature, can support for containerd image store be added, please? Normally, I would put this in the /etc/docker/daemon.json file, but since I don't have access to it, I cannot enable it. What should be added:

{
    "features": {
        "containerd-snapshotter": true
    }
}

The containerd image store provides more functionalities, and it allows me to export images into the OCI format.

-- OR --

Do a fresh install of Docker Engine on your VMs, as I can see now it comes with the containerd image store as the default storage backend. But only on fresh installs.

Thank you!