Description of problem: There's no lua-filesystem package for epel8. Please release one.
As long as the lua-filesystem package is part of RHEL 8 itself, it is impossible to have this package in EPEL 8. When enabling EPEL 8, you need to take care of the hints there: https://fedoraproject.org/wiki/EPEL#Quickstart - because the lua-filesystem package is in the CRB/PowerTools repository, which is disabled by default.