Dockerfile

FROM python:3.11-slim-bookworm AS builder

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

COPY requirements.txt .
RUN pip install --user --no-cache-dir -r requirements.txt && \
    pip install --user --no-cache-dir gunicorn

FROM python:3.11-slim-bookworm AS runtime

RUN groupadd -r appuser && \
    useradd -r -g appuser -d /app -s /sbin/nologin -u 1000 appuser

COPY --from=builder /root/.local /home/appuser/.local

ENV \
    PATH=/home/appuser/.local/bin:$PATH \
    PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1

WORKDIR /app
COPY --chown=appuser:appuser . .

USER appuser

EXPOSE 8000

HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
    CMD python -c "import urllib.request, sys; sys.exit(0 if urllib.request.urlopen('http://localhost:8000/health/liveness').status == 200 else 1)"

CMD ["gunicorn", "-k", "uvicorn.workers.UvicornWorker", "-w", "4", "--bind", "0.0.0.0:8000", "main:app"]