Dockerfile

# ── Stage 1: builder ──────────────────────────────────────────────────────────
FROM python:3.12-slim AS builder

WORKDIR /build

# Install only what's needed to compile Python packages
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    libpq-dev \
    && rm -rf /var/lib/apt/lists/*

COPY requirements.txt .
RUN pip install --upgrade pip && \
    pip wheel --no-cache-dir --no-deps --wheel-dir /build/wheels -r requirements.txt


# ── Stage 2: production image ─────────────────────────────────────────────────
FROM python:3.12-slim AS production

ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PATH="/app/.venv/bin:$PATH"

# Runtime system deps only
RUN apt-get update && apt-get install -y --no-install-recommends \
    libpq5 \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Create non-root user
RUN groupadd --gid 1001 appgroup && \
    useradd --uid 1001 --gid appgroup --shell /bin/bash --create-home appuser

WORKDIR /app

# Copy pre-built wheels from builder and install
COPY --from=builder /build/wheels /wheels
RUN pip install --no-cache-dir --no-index --find-links=/wheels /wheels/* && \
    rm -rf /wheels

# Copy application source
COPY --chown=appuser:appgroup . .

USER appuser

EXPOSE 8000

HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "4"]