add "--without-index-url" option to poetry export

[jrobbins-LiveData]

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• [ x] I have searched the documentation and believe that my question is not covered.

Feature Request

I am working with a private PyPi repository (AWS CodeArtifact). I need access to my locked dependencies inside a docker build. While there is more than one way to accomplish this, the simplest way for me is to run poetry export -f requirements.txt ... and use the following code in the Dockerfile:

COPY requirements.txt .
RUN pip install --index-url ${CODEARTIFACT_URL} -t . -r requirements.txt
RUN rm requirements.txt

But poetry export is adding this line to the top of my requirements.txt file, breaking my docker build:

--index-url https://[REDACTED DOMAIN]-[REDACTED ACCOUNT].d.codeartifact.us-east-2.amazonaws.com/pypi/[REDACTED REPO]/simple

Adding an option to suppress adding this --index-url would let me capture the locked dependencies and take care of the private CodeArtifact PyPi repo myself.

[DustinMoriarty]

I also found it a little odd for poetry to add the index URL's to the requirements file. I would be happy to look at making a PR for this.

[github-actions]

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