Creates a new ImageRawDisk.
containerType The format used to encode and transmit the block device, which
sha1 An optional SHA1 checksum of the disk image before unpackaging.
source The full Google Cloud Storage URL where disk storage is stored
The format used to encode and transmit the block device, which
should be TAR. This is just a container and transmission format
and not a runtime format. Provided by the client when the disk
image is created.
Default value is TAR.
Possible values are: TAR.