fix(ci): pick the kernel8 initramfs in the Tier 3 boot test

[JarbasAl]

Tier 3 run 29209071035 failed at kernel extraction: cp: target '/tmp/raspovos-boot.*/initrd': No such file or directory. The Bookworm boot partition ships one initramfs per kernel flavor (initramfs7, initramfs8, initramfs_2712, ...), so the initramfs* glob expands to several sources and cp expects a directory target. We boot kernel8.img, so select initramfs8, falling back to the first match.

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Reviewing files that changed from the base of the PR and between 28420b7 and 73853aa.

📒 Files selected for processing (1)

• scripts/ci/qemu_boot_test.sh

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• Commit unit tests in branch fix/tier3-initramfs-glob

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