Add --system flag to uv sync command to use it in Docker

[rfsan]

I have the current Dockerfile

FROM python:3.12-slim
ENV PYTHONUNBUFFERED=1
RUN apt-get update && \
    apt-get install -y git libgomp1 && \
    rm -rf /var/lib/apt/lists/*
ARG CODE=/app
WORKDIR $CODE
COPY pyproject.toml uv.lock ./
RUN --mount=from=ghcr.io/astral-sh/uv,source=/uv,target=/bin/uv \
    uv sync --frozen --no-cache --compile-bytecode --no-dev
COPY src/ src/
CMD [".venv/bin/python", "-m", "src.api_sample"]

I would like to install the dependencies using the system Python so that the final command is CMD ["python", "-m", "src.api_sample"]

I tried using uv pip install -r pyproject.toml --system but this approach does not use the uv.lock file

[Xdynix]

To force uv to use the system Python, provide the --python-preference only-system option.

Maybe consider this?

Ref: https://docs.astral.sh/uv/concepts/python-versions/#adjusting-python-version-preferences

[zanieb]

Please see https://docs.astral.sh/uv/guides/integration/docker/#using-the-environment and https://docs.astral.sh/uv/concepts/projects/#configuring-the-project-environment-path

This use-case should be resolved by #6834