• [ x] I have searched the issues of this repo and believe that this is not a duplicate.
• [ x] I have searched the documentation and believe that my question is not covered.

Feature Request

Right now it is possible to install only the dependencies of a package with the poetry install --no-root --no-dev options. This is great to improve docker builds (cache behaviour for example).

it would be great to extend that functionality to nested packages. Something like

poetry install --no-root --no-dev --no-root-nested

which would tell poetry to only install the dependencies of the nested package, but
not the package itself. This would greatly improve the caching behaviour of docker builds as we would only need
to copy the pyproject.toml and poetry.lock files into the docker machine which causes much better caching behaviour.