Allow relative paths when specifying local dependencies

[kfchou]

• [x] I am on the latest Poetry version.

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

• OS version: Ubuntu 20.04.6 LTS
• Poetry (version 2.1.2)
• Python version: 3.10

Issue:

Sort of a follow up to https://github.com/python-poetry/poetry-plugin-export/issues/145

my pyproject.toml file specifies a local dependency:

[tool.poetry.dependencies]
my_pkg = {path = "../../../my_pkg", develop=true}

The poetry.lock file specifies my_package with a relative path, which is correct.

But running poetry export --output requirments.txt results in

# requirements.txt
-e file:///full/path/to/my/local/dependency/my_pkg; 

this requirement.txt becomes unusable in CI due to the absolute path. There should be an optional to make the path in requirements.txt local path instead.