Use official RPM commands to verify repo being used in Plesk Installer
In the current state of Plesk installer, regular expressions are being used to verify EPEL release and installation state.
To support 3rd party repository, it would be advantageous if Plesk installer would use official RPM commands to verify. For example:
# rpm -q --whatprovides epel-release
# rpm -q --provides epel-release-rackspace
config(epel-release-rackspace) = 8-4.el8
epel-release-rackspace = 8-4.el8