[Docs] Document how to use poetry as the python package manager

[eapolinario]

Description

https://python-poetry.org/ should be supported as a packager manager. In https://flyte-org.slack.com/archives/CP2HDHKE1/p1734613391404869?thread_ts=1734610263.071079&cid=CP2HDHKE1 a user figured out the right invocation of poetry in a dockerfile, it basically boils down to having this as the ENTRYPOINT in a docker file:

ENTRYPOINT ["poetry", "run", "--"]

We should add a full example to the docs to help poetry users run flytekit.

Dockerfile

A sample dockerfile might look something like

FROM pytorch/pytorch:2.1.2-cuda11.8-cudnn8-devel

# Install system dependencies
RUN apt-get update --fix-missing && \
    apt-get install -y git python3-pip && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

# Install Python dependencies before copying the rest of the code
WORKDIR /app
COPY poetry.lock pyproject.toml /app/
RUN pip --disable-pip-version-check install "poetry==1.5.1" awscli && \
    poetry config virtualenvs.create true && \
    poetry config virtualenvs.in-project true && \
    poetry config virtualenvs.options.always-copy true && \
    poetry install --no-interaction --no-ansi

# Copy the rest of the code
COPY . /app

# Set up a generic entrypoint so we can run arbitrary commands in the poetry environment
# Pass an argument separator so that poetry doesn't consume any further argument separators
ENTRYPOINT ["poetry", "run", "--"]

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