bug: unable to pass empty --option value

[rszyma]

Passing empty nixConfig value to nix is normally allowed, but it isn't possible when using deploy-rs, e.g.:

deploy . -- --option build-users-group ''

error: The argument '<extra-build-args>...' requires a value but none was supplied

USAGE:
    deploy [FLAGS] [OPTIONS] [--] [ARGS]

For more information try --help

This is probably a bug in clap. It looks like we're using an archaic clap version "3.0.0-beta.2", while there's already 4.5.32 out. Maybe we could try bump to latest version and see it the issue is fixed. I've tried bumping it latest version, but I'm getting an error from cargo that it's too old, so a flake bump would be needed too, to bump cargo.

error: package `clap v4.5.32` cannot be built because it requires rustc 1.74 or newer, while the currently active rustc version is 1.73.0

[Chaostheorie]

It seems your guess was correct, it appears to work with the updates from #317