However, if you want to use podman from within a toolbox container, you can use flatpak-spawn --host to run a command from outside the toolbox from within the toolbox.
If you alias podman to flatpak-spawn --host podman inside your container, then it’ll run your system’s podman command from within the container.
This is mainly useful if you have a terminal set up to launch your dev environment as a toolbox container and you want to run a command outside of your container sometimes.
(For what it’s worth, some commands already seem to mostly “just work” inside a container, like toolbox and rpm-ostree.)