Dockerfile

###############################################
# Base Image
###############################################
FROM python:3.9.1-slim-buster as python-base

ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PIP_NO_CACHE_DIR=off \
    PIP_DISABLE_PIP_VERSION_CHECK=on \
    PIP_DEFAULT_TIMEOUT=100 \
    POETRY_VERSION=1.1.4 \
    POETRY_HOME="/opt/poetry" \
    POETRY_VIRTUALENVS_IN_PROJECT=true \
    POETRY_NO_INTERACTION=1 \
    PYSETUP_PATH="/opt/pysetup" \
    VENV_PATH="/opt/pysetup/.venv"

# prepend poetry and venv to path
ENV PATH="$POETRY_HOME/bin:$VENV_PATH/bin:$PATH"

###############################################
# Builder Image
###############################################
FROM python-base as builder-base

RUN apt-get update \
    && apt-get install --no-install-recommends -y \
    build-essential \
    curl \
    gcc \
    libpq-dev \
    python3-dev \
    && rm -rf /var/lib/apt/lists/*

# install poetry - respects $POETRY_VERSION & $POETRY_HOME
RUN curl -sSL https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py | python3

# copy project requirement files here to ensure they will be cached.
WORKDIR $PYSETUP_PATH
COPY poetry.lock pyproject.toml ./

# install runtime deps - uses $POETRY_VIRTUALENVS_IN_PROJECT internally
RUN poetry install --no-dev

###############################################
# Production Image
###############################################
FROM python-base as production
ARG DJANGO_ALLOWED_HOSTS
ARG SECRET_KEY

ENV DJANGO_ALLOWED_HOSTS=$DJANGO_ALLOWED_HOSTS
ENV SECRET_KEY=$SECRET_KEY

RUN apt-get update \
    && apt-get install --no-install-recommends -y \
    gcc \
    libpq-dev \
    python3-dev \
    && rm -rf /var/lib/apt/lists/*
    
COPY --from=builder-base $PYSETUP_PATH $PYSETUP_PATH

# Set working dir
WORKDIR /usr/src/app

# copy project
COPY src .
         
CMD [poetry,run,python,manage.py,runserver]