Does poetry still only work for libraries or does it work well for apps too now?

What do you mean? You mean for installing Python apps on your computer? I just use `pip install --user` for that.

No like if you want to put a webapp in a virtualenv in a docker to run somewhere.

I remember pipenv used to support this pretty well but it was out if scope for poetry.

Edit: there's a 'poetry run' command now so it might be fixed. Don't remember what was broken.