Is your feature request related to a problem? Please describe.
Yeah. On my system (Void musl), podman stop does not stop a rootless container, erroring with Error: given PID did not die within timeout. Thus the container does not actually get deleted, defeating the point of having an 'ephemeral' container.

Describe the solution you'd like
In the case of podman, close ephemeral containers with podman kill. This may also require a related distrobox kill to be called by distrobox-ephemeral.

Describe alternatives you've considered
Fixing the original problem of containers not being stopped properly (I have no idea how to do this)
Running podman --rm

Additional context
On void, at least for me, I sometimes have to use sudo pkill instead of pkill. I'm not sure why. This is probably related.
podman kill always works on my system, rootless or otherwise.