fix: Copy 'os-images' content one item at a time (#381)
fix: Copy 'os-images' content one item at a time (#381)

The contents of the 'os-images' directory are archived and copied into
the container. The archive can become quite large if multiple OS images
are present. The files and directories can be copied one at a time to
reduce the total memory required to load the archive.
open-power-ref-design-toolkit/cluster-genesis,open-power-ref-design-toolkit/cluster-genesis