It makes sense to compress RAW images for their storage. Thus, when download URL is provided for the image, it highly likely can be compressed. While Glance did support upload of compressed images, it is not anymore due to security concerns. So we need to decompress such images before upload is performed Needed-By: https://review.opendev.org/c/openstack/openstack-ansible-os_magnum/+/946560 Change-Id: I63d79a18d90e37ff98d407018bc76e7af63e69be