SkyPilot - Is it possible to instantiate a machine from a disk snapshot on a cloud platform?

The current cloud platform does not support instantiating a machine directly from a disk snapshot.
There is a related feature to clone from an existing SkyPilot cluster, which can be useful for initializing a new cluster with the same data on the boot disk.
One suggestion to reduce Docker pull time is to create a machine image from the VM attached to the disk, which can be used to launch clusters.
There is an open issue to track the ability to use both an AMI and a Docker image with the image_id field in the cloud platform.