Add option to install the package in non-editable mode

[ghost]

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

Feature Request

It would be nice to have a way to install the package in non-editable mode. 'poetry install' always installs the package itself in editable mode. Having it installed in non-editable mode would be useful to have a self-contained virtualenv, that could then be packaged via fpm or be used inside a docker container.

A workaround at the moment is to use the install --no-root flag, build a sdist or wheel and install that with pip.

[sdispater]

The idea is similar to some mentioned in #537 so closing this issue

[github-actions]

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