Para openSUSE Leap 15.4 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:SCNOPS:php81/openSUSE_Leap_15.4/home:SCNOPS:php81.repo
zypper refresh
zypper install php8
Para openSUSE Leap 15.3 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:SCNOPS:php81/openSUSE_Leap_15.3/home:SCNOPS:php81.repo
zypper refresh
zypper install php8
Para SLE 15 SP4 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:SCNOPS:php81/SLE_15_SP4/home:SCNOPS:php81.repo
zypper refresh
zypper install php8
Para SLE 15 SP3 execute o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:SCNOPS:php81/SLE_15_SP3/home:SCNOPS:php81.repo
zypper refresh
zypper install php8