Edit the /etc/yum.repos.d/_copr:copr.fedorainfracloud.org:fepitre:xfce4-i3.repo in dom0 and change gpgkey from URL to the pubkey.gpg file path e.g.:
Edit the /etc/yum.repos.d/_copr:copr.fedorainfracloud.org:fepitre:xfce4-i3.repo in dom0 and change gpgkey from URL to the pubkey.gpg file path e.g.: