python-multi-stage-build.Dockerfile

# syntax = docker/dockerfile:1.3
FROM python:3.9-slim as builder

WORKDIR /app

ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

RUN apt-get update && \
    apt-get install -y --no-install-recommends build-essential

RUN --mount=type=cache,target=/root/.cache/pip,id=pip_cache,sharing=locked \
    pip wheel --wheel-dir /wheels pycocotools


FROM python:3.9-slim

RUN --mount=type=bind,from=builder,source=/wheels,target=/wheels \
    pip install --no-cache /wheels/* 

# doc from: https://yeasy.gitbook.io/docker_practice/buildx/buildkit
# build command:
# docker buildx build -t app --progress plain  .