For 15.7 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:robertday:jailkit/15.7/home:robertday:jailkit.repo
zypper refresh
zypper install jailkit
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:robertday:jailkit/15.6/home:robertday:jailkit.repo
zypper refresh
zypper install jailkit
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:robertday:jailkit/15.5/home:robertday:jailkit.repo
zypper refresh
zypper install jailkit
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:robertday:jailkit/15.4/home:robertday:jailkit.repo
zypper refresh
zypper install jailkit
For 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:robertday:jailkit/15.3/home:robertday:jailkit.repo
zypper refresh
zypper install jailkit