For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Dead_Mozay:GNOME:Apps/openSUSE_Tumbleweed/home:Dead_Mozay:GNOME:Apps.repo
zypper refresh
zypper install foliate
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Dead_Mozay:GNOME:Apps/openSUSE_Slowroll/home:Dead_Mozay:GNOME:Apps.repo
zypper refresh
zypper install foliate
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Dead_Mozay:GNOME:Apps/15.6/home:Dead_Mozay:GNOME:Apps.repo
zypper refresh
zypper install foliate