[Bug 2038449] [NEW] Use pixz for compressing images

[Heinrich Schuchardt]

Public bug reported:

We currently use xz for compression.

live-build/ubuntu-cpc/hooks.d/base/disk1-img-xz.binary:14:    xz -T4 -c binary/boot/disk-uefi.ext4 > livecd.ubuntu-cpc.disk1.img.xz
live-build/ubuntu-cpc/hooks.d/base/disk1-img-xz.binary:16:    xz -T4 -c binary/boot/disk.ext4 > livecd.ubuntu-cpc.disk1.img.xz

At least on riscv64 this is a major driver for the build time. We should
pixz to parallelize the compression.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: foundations-todo fr-5579

** Tags added: fr-5579

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Title:
  Use pixz for compressing images

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  We currently use xz for compression.

  live-build/ubuntu-cpc/hooks.d/base/disk1-img-xz.binary:14:    xz -T4 -c binary/boot/disk-uefi.ext4 > livecd.ubuntu-cpc.disk1.img.xz
  live-build/ubuntu-cpc/hooks.d/base/disk1-img-xz.binary:16:    xz -T4 -c binary/boot/disk.ext4 > livecd.ubuntu-cpc.disk1.img.xz

  At least on riscv64 this is a major driver for the build time. We
  should pixz to parallelize the compression.

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