fix(ci): boot the Tier 3 image via NVMe, not virtio

[JarbasAl]

Tier 3 run 29209587280 reached the initramfs but ALERT! /dev/vda2 does not exist. Inspection of the image's modules.builtin/initramfs shows the Pi kernel has no virtio drivers at all, while nvme, xhci-pci, usb-storage and sd_mod are built in (they're the Pi 4/5 boot-media drivers). Switch the qemu disk to an NVMe device (root=/dev/nvme0n1p2) and the user-mode NIC to usb-net behind qemu-xhci.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Improved the aarch64 virtual machine boot test configuration.
  • Updated storage and networking emulation to improve compatibility and reliability during smoke tests.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f91ad370-aaf0-4936-b6c0-e96db083651c

📥 Commits

Reviewing files that changed from the base of the PR and between 6a5cd0d and 3c9ed69.

📒 Files selected for processing (1)

• scripts/ci/qemu_boot_test.sh

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📝 Walkthrough

Walkthrough

The Tier 3 aarch64 QEMU smoke test now boots from an emulated NVMe disk and uses a USB network device instead of virtio storage and networking.

Changes

QEMU boot configuration

Layer / File(s)	Summary
NVMe storage and USB networking scripts/ci/qemu_boot_test.sh	QEMU arguments add an NVMe-attached boot disk, update the kernel root path to /dev/nvme0n1p2, and replace virtio networking with an XHCI-attached USB NIC.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main CI boot change from virtio to NVMe.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/tier3-nvme-disk

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