grub2-x86_64-efi from home:michael-chang:grub:devel:CI project
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Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:michael-chang:grub:devel:CI/openSUSE_Tumbleweed/home:michael-chang:grub:devel:CI.repo zypper refresh zypper install grub2-x86_64-efi