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Markus Hilger
cfc4490fe1
`unsquashfs` can use multiple CPU cores during image extraction, significantly reducing boot time. For example the whole boot time from PXE to shell on a 8-core VM, from approximately 45 seconds to 20 seconds. This PR adds `squashfs-tools` as a dependency. Since the package is smaller than 1 MB, the additional image size is justified by the performance improvement. For backward compatibility, the existing `cp`-based extraction method is used when `unsquashfs` is unavailable, such as with images built before this change. The extraction logic has also been moved into the common functions and is now shared between EL9, EL10, and Ubuntu. Both untethered `squashfs` images and `confluent_multisquash` images are supported. Images must be rebuilt to include `unsquashfs` and benefit from the faster extraction path.