Podman is available inside the Solus repository but there is a "missing" dependency for it. Indeed, fuse-overlay is used to provide an Overlay FS to rootless containers for Podman and therefore provides copy-on-write for these. This is not the case in Solus, Podman uses a kind of "backup" backend, named VFS, due to the lack of this FUSE driver.
Why it's useful ? By bringing copy-on-write, there is an efficient disk usage, because with the VFS storage backend, each newly created container copies the entire underlying image filesystem, there is a lot of data duplication, this is not ideal imo. Docker uses also OverlayFS (not through fuse also) by default.
Here is the link to Github repo : https://github.com/containers/fuse-overlayfs
Link to the last version : https://github.com/containers/fuse-overlayfs/archive/v0.6.4.zip