[recovery-installer] Run installation script in chroot
As @ollieparanoid and @drebrez already suggested, the recovery installer could create a minimal chroot instead of adjusting $PATH.
Benefits:
- no need to rely on the tools provided by the recovery
- makes the script cleaner
It could be done by including two tar archives, one for the chroot and the other for the pmos system. We would only need to extract tar
outside the chroot.
Any thoughts?