chore: Set x86 qcow imager to 24.04 & add packages

[jdubs]

Description

• Updates the qcow-imager EFI image build configuration from Debian Bookworm to Ubuntu Noble (24.04) matching the arm64 qcow imager
• adds missing packages to both x86_64 and aarch64 profiles, removed duplicate packages and alphabetized the list.
• convenience Makefile tasks (build-qcow-imager-x86 and build-qcow-imager-aarch64) for building each architecture independently without scout/BFB.

New images:

• arm64 - qcow-imager.efi ~ 191M
• x86 - qcow-imager.efi ~ 148M

Old Images:

• arm64 - qcow-imager.efi ~ 879M
• x86 - qcow-imager.efi ~ 235M - bookworm

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
• Remove - Removed features or deprecated functionality
• Internal - Internal changes (refactoring, tests, docs, etc.)

Related Issues (Optional)

Breaking Changes

• This PR contains no breaking changes

Testing

• Manual testing performed

Additional Notes

• x86_64 profile: switched base from debian:bookworm → ubuntu:noble, swapped linux-image-amd64 → linux-image-generic, added efibootmgr, file, and iproute2 packages, enabled zstd (level 19) output compression, and
  removed the SandboxTrees=mkosi.apt setting
• aarch64 profile: added efibootmgr and iproute2 packages, removed SandboxTrees=mkosi.apt
• New build-qcow-imager-x86 and build-qcow-imager-aarch64 Makefile tasks allow building a single architecture's imager EFI without triggering the full scout/BFB pipeline

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[Copilot]

Pull request overview

This PR updates the qcow-imager mkosi profiles to align the x86_64 build with Ubuntu 24.04 (matching arm64), adds a few missing tooling packages, enables zstd compression for the produced artifacts, and introduces Makefile tasks to build qcow-imager per-architecture without running the full scout/BFB pipeline.

Changes:

• Switch qcow-imager (x86_64) mkosi profile from Debian bookworm → Ubuntu noble (24.04), update repositories, and adjust kernel package selection.
• Add missing packages (e.g., efibootmgr, iproute2, file) and remove SandboxTrees=mkosi.apt from the arm64 qcow-imager profile.
• Add build-qcow-imager-x86 and build-qcow-imager-aarch64 tasks in pxe/Makefile.toml for standalone per-arch builds.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
pxe/mkosi.profiles/qcow-imager/mkosi.conf	Moves x86 qcow-imager to Ubuntu 24.04, enables zstd compression, and updates/adds required packages.
pxe/mkosi.profiles/qcow-imager-aarch64/mkosi.conf	Removes SandboxTrees and adds missing packages for parity with other profiles.
pxe/Makefile.toml	Adds dedicated per-architecture qcow-imager build tasks to avoid triggering the full build pipeline.

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[kensimon]

Any reason we're moving to ubuntu for the x86 one, instead of moving to debian for the aarch64 one? All things being equal I think we'd prefer debian, if only because the image is less than 1/3 the size...

[jdubs]

I was debating on that too, I figured since arm64 was newer and was built with Ubuntu, that's probably the preferred route going forward. I can modify this MR and test using Debian 11 on arm64 or I could take both images to Debian 12. Which would you prefer?

[jdubs]

After discussing with Ken, we decided to merge this since moving the arm64 qcow imager to debian might create complexities due to different drivers.

[jdubs]

I changed the to linux-image-virtual which reduced the size of the qcow image to about 140mb. I did not find any loss of functionality during the qcow imaging process.

I tested this change on the following instance types
supermicro super-grace
gb200
cpu.x86_64
gpu.l40x8.ovx.t1.ibx2