For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:dsterba:btrfs/openSUSE_Factory/home:dsterba:btrfs.repo
zypper refresh
zypper install podman
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:dsterba:btrfs/15.5/home:dsterba:btrfs.repo
zypper refresh
zypper install podman
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:dsterba:btrfs/15.4/home:dsterba:btrfs.repo
zypper refresh
zypper install podman