Unexpected results when -d is passed a relative path

[andychu]

Since the docs say the directory should be absolute, the script should fail if it's not the case

I can send a patch for it

  -d CHROOT_DIR          Absolute path to the directory where Alpine chroot
                         should be installed (default is /alpine).

What happens if I do alpine-chroot-install -d _chroot/foo is that I get the choot in

_chroot/foo/_chroot/foo

which is not friendly or correct

This is because the script assumes absolute paths, but doesn't check it