feat: Support `--target` input in `args`

[FabianLars]

This is really not a nice solution, but a better one would need a bigger rewrite which i don't have time for tbh. We should have a cargo metadata follow-up PR either way in case people commit their config.toml file.

Another problem is how it deletes existing release assets. The way it is now it will remove them per OS, not per arch, so you can't upload a .dmg file for example for both arches. The .app file obviously has a naming problem, so maybe we don't want to support this at all right now?

Successful run: https://github.com/FabianLars/mw-toolbox/actions/runs/3078695681

Release:

p.s. i didn't plan to PR from this branch so the commit messages are weird, but squash merge to the rescue 🥳