For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ur4ltz:neovim/openSUSE_Tumbleweed/home:ur4ltz:neovim.repo
zypper refresh
zypper install lua51
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ur4ltz:neovim/15.6/home:ur4ltz:neovim.repo
zypper refresh
zypper install lua51
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ur4ltz:neovim/15.5/home:ur4ltz:neovim.repo
zypper refresh
zypper install lua51