FROM python:3.12-slim

ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1

WORKDIR /app

# Install build dependencies (needed for some Python packages, e.g. Pillow)
RUN apt-get update && apt-get install -y --no-install-recommends \
        gcc \
    && rm -rf /var/lib/apt/lists/*

# Pre-install requirements at build time so the layer is cached.
# The entrypoint re-runs pip install on every container start to pick up
# any changes that arrived via git pull without needing a rebuild.
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# The source code is NOT copied here — the git repo is bind-mounted
# at /app at runtime (see docker-compose.yml).

EXPOSE 8000

# entrypoint.sh lives in the mounted repo at /app/docker/entrypoint.sh
ENTRYPOINT ["/app/docker/entrypoint.sh"]