docker/docker_transport.go
func (ref dockerReference) DeleteImage(ctx context.Context, sys *types.SystemContext) error {
	return deleteImage(ctx, sys, ref)
}
func (ref dockerReference) DeleteImage(ctx context.Context, sys *types.SystemContext) error {
	return deleteImage(ctx, sys, ref)
}
// DeleteImage deletes the named image from the registry, if supported.