Para openSUSE Tumbleweed corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:-miska-:loki/openSUSE_Tumbleweed/home:-miska-:loki.repo
zypper refresh
zypper install promtail
Para 15.6 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:-miska-:loki/15.6/home:-miska-:loki.repo
zypper refresh
zypper install promtail
Para 15.5 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:-miska-:loki/15.5/home:-miska-:loki.repo
zypper refresh
zypper install promtail