Add a configuration option for get-poetry.py to only install _vendor dependencies for the current Python version.

[ruohola]

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Feature Request

Currently the get-poetry.py install script installs Poetry's dependencies for Python versions 2.7, 3.5, 3.6, 3.7, 3.8, and 3.9 to .poetry/lib/poetry/_vendor/, and they all take around 30MB each. This is annoying when trying to make minimal Docker images. Could there be an environment variable or another configuration option to only install these for the currently used Python version?

[ruohola]

In the meantime, I've been using:

find /home/user/.poetry/lib/poetry/_vendor/ -mindepth 1 -maxdepth 1 -not -name py3.9 -type d | xargs rm -rf 

in my Dockerfiles.

[abn]

This should go away with the new bootstrapping mechanism (see #3706). Feel free to test it out. Additionally, you could simply use pip install poetry in your Dockerfile.

[ruohola]

This should go away with the new bootstrapping mechanism (see #3706).

Looks promising, thanks!

Additionally, you could simply use pip install poetry in your Dockerfile.

Yeah I know, but I really like the fact that by installing with the get-poetry.py script Poetry's own dependencies are completely isolated from my other packages.

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