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feat(system_imaging): stage disk images from oras:// artifacts

oras artifacts have no stable download URL, so consumers such as the nosi
guest images each reimplemented the bearer-token dance to fetch them. Add
a diskimage_from_oras script that resolves an image's oras source with
withcache, pulls and decompresses the blob with curl, and converts it to
the qcow2 at disk.path. The pull is skipped when the pinned image is
already staged, keyed on the content digest. withcache becomes a runtime
dependency.

Signed-off-by: Simon A. F. Lund <os@safl.dk>

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