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Introduces an intermediate format for overlayfs storage, where .wh-ostree. prefixed files will be converted into char 0:0 whiteout devices used by overlayfs to mark deletions across layers. The CI scripts now uses a volume for the scratch directories previously in /var/tmp otherwise we cannot create whiteout devices into an overlayfs mounted filesystem. Related-Issue: #2712 (cherry picked from commit e234b630f85b97e48ecf45d5aaba9b1aa64e6b54)