I described the full process here [1]. The only thing that seems to differ is podman for you.

Ah, I see:

> 4) As root, installed podman

I installed docker as the non-root user. See my Mastodon post, there's a specific procedure to install Docker in a user namespace ("devel" in your case).

[1]: https://du.nkel.dev/blog/2021-03-25_proxmox_docker/