For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:gregfreemyer:Tools-for-forensic-boot-cd/openSUSE_Tumbleweed/home:gregfreemyer:Tools-for-forensic-boot-cd.repo
zypper refresh
zypper install yarn
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:gregfreemyer:Tools-for-forensic-boot-cd/15.6/home:gregfreemyer:Tools-for-forensic-boot-cd.repo
zypper refresh
zypper install yarn
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:gregfreemyer:Tools-for-forensic-boot-cd/15.5/home:gregfreemyer:Tools-for-forensic-boot-cd.repo
zypper refresh
zypper install yarn
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:gregfreemyer:Tools-for-forensic-boot-cd/15.4/home:gregfreemyer:Tools-for-forensic-boot-cd.repo
zypper refresh
zypper install yarn