GCP: Reverting/rollback an instance to a snapshot

All GCP Compute Engine Disks are snapshotted daily. In order to revert to snapshot, use this procedure: * Create new disk based on snapshot that was made from working disk * https://cloud.google.com/compute/docs/images/create-delete-deprecate-private-images#create_image * Shutdown failed instance and detach old disk and attach new one * https://cloud.google.com/compute/docs/disks/detach-reattach-boot-disk