Joliet ensures correct file names capitalization on operating systems that support Joliet but not support Rock Ridge.
Implements https://gitlab.archlinux.org/archlinux/archiso/-/issues/45 .
https://github.com/archlinux/archiso/commit/
41d3d7d4897ca35812ec07327efcbe4248bd6bbd
xorriso -as mkisofs ${_qflag} \
-iso-level 3 \
-full-iso9660-filenames \
+ -joliet \
+ -joliet-long \
-rational-rock \
-volid "${iso_label}" \
-appid "${iso_application}" \