Comment by orbisvicis

You can also do some neat things with "--ephemeral" and "--volatile" to basically overlay the image (or a subset) with tmpfs; any changes to those overlays will be lost when the container is brought down. The specific mount points can be controlled in greater detail via "--tmpfs" and "--overlay".

https://0pointer.net/blog/running-an-container-off-the-host-...

I'm not sure how easy that is to customize in Podman.