Just had a play with this on a VM.
Really not much of a challenge to adjust to from docker. The posix style CLI args are quite similar as is the stdout.
This was enough to get me into a container:
debcontainer=$(buildah from debian)
buildah run $debcontainer /bin/bash
root@61badeb3d050:/# uname -r
4.10.15-200.fc25.x86_64