- Move detect_shell() to new src/utils.rs for reuse
- Use detected shell in QEMU VM mode (bash when available)
- Update chroot.rs and qemu_vm.rs to use shared function
Generate hostname like "ecr-vm-<hex>" at boot time via kernel command
line, leaving initramfs cacheable. Set via echo to /etc/hostname and
hostname command before spawning shell.
Add --kernel <PATH> option to boot extracted rootfs in a QEMU virtual
machine instead of namespace/chroot mode. The rootfs is converted to an
ext4 disk image using mke2fs and booted with the provided kernel.
vhaudiquet