Allow changing the container command

[duck-rh]

Fixes #19

[jonasbb]

Thanks for the PR :)
Disabling the shellcheck warning for that one line is probably fine. I couldn't find a way to have a default array value, otherwise quoting like PODMAN_RUN_ARGS would be possible.

[duck-rh]

I guess noone would use a command with arguments, so quoting is probably fine. We can change to disabling the check if someone comes with a use case.

[jonasbb]

The default sleep 999999999 uses an argument. Adding the quotes will break that. I think supressing the warning for that line should be fine. You can add a # shellcheck disable=... with the correct error code before the podman run.

[jonasbb]

I finished the PR by disabling the shellcheck error. Thank you for providing the PR.

[duck-rh]

@jonasbb thanks a lot