Dockerfile from slim Debian image, remove poetry from server image

Dockerfile

@@ -1,18 +1,28 @@
-FROM python:3.9-slim
+FROM python:3.9-slim-buster as builder
 ENV PYTHONUNBUFFERED 1
-WORKDIR /app
 COPY . ./
 
 ENV POETRY_VERSION=1.1.4
 
-RUN apt-get update && apt-get install --no-install-recommends -y build-essential
-
-RUN pip install -U pip
 RUN pip install "poetry==$POETRY_VERSION"
+RUN poetry export > requirements.txt
 
-RUN poetry config virtualenvs.create false \
+FROM python:3.9-slim-buster as server
-  && poetry install --no-dev --no-interaction --no-ansi
+
+WORKDIR /app
+COPY . ./
+COPY --from=builder requirements.txt ./
+
+ENV PYTHONUNBUFFERED=1 \
+    # prevents python creating .pyc files
+    PYTHONDONTWRITEBYTECODE=1 \
+    # pip
+    PIP_NO_CACHE_DIR=off \
+    PIP_DISABLE_PIP_VERSION_CHECK=on \
+    PIP_DEFAULT_TIMEOUT=100
+
+RUN apt-get update && apt-get install --no-install-recommends -y build-essential
+RUN pip install -r requirements.txt
 
 RUN python manage.py collectstatic --noinput
-
 CMD ["sh", "-c", "./production_entrypoint.sh"]