sys-kernel/bootengine: pull ignition changes

[tormath1]

this pulls Ignition reordering to fix Equinix Metal issues. (flatcar/bootengine#99) (upstream: coreos/ignition#1940)

---

Ignition will POST a status update to Equinix Metal at each stage (disk, mount, files, etc.). The failure occurs in mount service, because systemd-networkd is shutted down, as all other services because initrd-cleanup.service is started.
initrd-cleanup.service is started because Ignition has reported success (last stage files is executed with success) so the Ignition complete target is reached.

But the mount service has an ExecStop condition:

ExecStop=/usr/bin/ignition --root=/sysroot --platform=${PLATFORM_ID} --stage=umount ${IGNITION_ARGS}

which will fail on Equinix Metal because as said: we need the network to POST updates to Equinix Metal

Testing done

• Changelog entries added in the respective changelog/ directory (user-facing change, bug fix, security fix, update)
• Inspected CI output for image differences: /boot and /usr size, packages, list files for any missing binaries, kernel modules, config files, kernel modules, etc.
• CI: http://localhost:8080/job/container/job/packages_all_arches/4680/cldsv/

Related to: flatcar/Flatcar#1536

[tormath1]

cherry-picked to:

• flatcar-4081
• flatcar-4054
• flatcar-3510 (via flatcar-3510-backport)

For Stable, I'm still considering if we should or not create a backport branch on bootengine to avoid shipping the PXE/ISO fix in Stable directly.

[github-actions]

Build action triggered: https://github.com/flatcar/scripts/actions/runs/10883888286