Goal:

• Implement support for creating disk images in bootc-image-builder. The intended flow is this one:
  • https://github.com/osbuild/images/blob/main/docs/image-types/rhel8/google-gce.md#importing-virtual-disks-to-gce
  • https://cloud.google.com/compute/docs/import/import-existing-image#requirements_for_the_image_file

Acceptance Criteria:

• Users can use bib for creating Google Cloud-compatible disk image artifacts.