This element installs the Extra Packages for Enterprise Linux (EPEL) repository GPG key as well as configuration for yum.
Note this element is only useful with platforms that have EPEL support such as CentOS and RHEL
To use a EPEL Yum mirror, set this variable to the mirror URL before running bin/disk-image-create. This URL should point to the directory containing the
To disable the EPEL repo (but leave it available if used with an explicit
--enablerepo) set this to 1