spawn throwaway systemd or non-systemd based containers using ssh.

 export DOCKER_API_VERSION=1.45
 go run .

and then:

 ssh -l "jrei/systemd-debian" -o StrictHostKeychecking=no localhost -p 2222

or likewise:

RHEL:
 ssh -l "registry.access.redhat.com/ubi9/ubi-init:latest" -o StrictHostKeychecking=no localhost -p 2222
SLES:
 ssh -l "registry.suse.com/bci/bci-init:15.6" -o StrictHostKeychecking=no localhost -p 2222

regular:

ssh -l "debian:bookworm" -o StrictHostKeychecking=no localhost -p 2222
ssh -l "alpine:latest" -o StrictHostKeychecking=no localhost -p 2222