Command line --project-directory missing

Currently, when running a compose file in a sub-folder, it takes that folder as a basis for all subsequent elements.

Imagine parent with .yaml file in sub-folder and invocating using `podman compose --file=sub/myproject.yaml`
If any folder registered in volume in the form of `../anothersub`, path substitution is converting this to `sub/sub/anothersub` which is clearly an error.

Being able to specify `--project-directory parent` would avoid related issues and enhance docker compatibility.