This script was removed in #1793; instead of restoring it, instead implement its functionality directly in the COPR Makefile.
Also fix a bug in the tarball creation that existed even prior to moving it into create_tarball.sh
This adds enhancements so that Fedora/EL packages can be automatically built in COPR when a webhook is received. A typical webhook could be for tagging events for example or even a "Release" webhook to only build releases.
