For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:jsegitz:branches:devel:openSUSE:Factory/standard/home:jsegitz:branches:devel:openSUSE:Factory.repo
zypper refresh
zypper install shim
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:jsegitz:branches:devel:openSUSE:Factory/openSUSE_Factory_ARM/home:jsegitz:branches:devel:openSUSE:Factory.repo
zypper refresh
zypper install shim
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:jsegitz:branches:devel:openSUSE:Factory/15.5/home:jsegitz:branches:devel:openSUSE:Factory.repo
zypper refresh
zypper install shim