Python clean slim app docker file

Dockerfile

# syntax=docker/dockerfile:1.5.2

##
## Python clean slim app docker file
## 

FROM python:3.11.4-slim-bullseye as builder

## RUN apt install here

RUN --mount=type=cache,target=/root/.cache/pip \
  python -m pip install -U pip && python -m pip install hatch

WORKDIR /app
COPY . .


RUN --mount=type=cache,target=/root/.cache/pip \
  hatch build -t wheel \
  && python -m venv /app/.venv \
  && /app/.venv/bin/python -m pip install /app/dist/*.whl


FROM python:3.11.4-slim-bullseye as prepare

## RUN apt install here

RUN groupadd -g 999 app \
  && useradd -r -u 999 -g app app

COPY --from=builder /app /app
WORKDIR /app/workdir

RUN chown -R app:app /app


FROM scratch  # (optional) just to squash

EXPOSE 8000
USER 999
ENV PATH="/app/.venv/bin:$PATH"

ENTRYPOINT []
CMD ["python", "-m", "app.main"]  # your app name

WORKDIR /app/workdir
COPY --from=prepare / /