Basically, similar in spirit to flatpak-spawn --forward-fd= and podman exec --preserve-fds= it would be lovely to be able to do the same with Toolbox.

An alternative to this would be a "dry-run" mode for toolbox run that shows me which podman commandline would be used, allowing me to hack it for myself.

As a workaround, for the time being, I'm running toolbox run env to start the toolbox and get a list of the environment variables and then constructing an approximate podman exec invocation using the output.