For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Dead_Mozay:waydroid/openSUSE_Tumbleweed/home:Dead_Mozay:waydroid.repo
zypper refresh
zypper install waydroid
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Dead_Mozay:waydroid/15.5/home:Dead_Mozay:waydroid.repo
zypper refresh
zypper install waydroid
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Dead_Mozay:waydroid/15.4/home:Dead_Mozay:waydroid.repo
zypper refresh
zypper install waydroid