ubuntu-cpc project remove armhf vm images until grub2 armhf fixes in place

[John Chittum]

grub-efi-arm and grub-efi-arm-bin are not currently installable for armhf images. This leads to build failures for in the disk-image-uefi.binary in the ubuntu-cpc image.

the future of UEFI booting armhf cloud images is currently in question, with possibilities including:

1. removing VM images entirely for armhf (due to lack of hardware support)
2. keeping a Bios booting VM available for armhf (need to check booting on appropriate devices, such as an older Raspberry Pi)
3. fixing grub-efi-arm and grub-efi-arm-bin and re-enabling UEFI booting armhf cloud images.

In the short term, removing armhf from the list of supported architectures results in skipping the hook.

### Testing

The required change must be tested with a Launchpad built livecd-rootfs.

### NOTE ###

This is not for SRU, only noble forward at this time.

[Steve Langasek (vorlon)]

> keeping a Bios booting VM available for armhf (need to check booting on appropriate devices, such as an older Raspberry Pi)

No such thing. There are no arm devices that use BIOS as a boot protocol. There is only UEFI.

And these are cloud images, so booting on hardware (such as Raspi) should be out of scope.

Also we do not support armhf on the RasPi in noble.

[Steve Langasek (vorlon)]

> 3. fixing grub-efi-arm and grub-efi-arm-bin and re-enabling UEFI booting armhf cloud images.

This is going to happen regardless. It's not "broken", it's just caught up in the time_t transition and binaries were temporarily removed to unblock a critical bug fix, thinking there would be no impact from the removal.

[Launchpad Janitor (janitor)]

This bug was fixed in the package livecd-rootfs - 24.04.52

---------------
livecd-rootfs (24.04.52) noble; urgency=medium

  * Move from hwe-22.04 to hwe-24.04 throughout, hwe-22.04 is obsolete and
    to be dropped from the release pocket imminently.

 -- Steve Langasek <email address hidden> Wed, 27 Mar 2024 12:03:04 -0700