Dockerfile

# ── Stage 1: Build & Dependencies ───────────────────────────────────────────
FROM python:3.11-slim AS builder

WORKDIR /app

ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1

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

COPY requirements.txt .
RUN pip install --no-cache-dir --prefix=/install -r requirements.txt

# ── Stage 2: Production Runtime ──────────────────────────────────────────────
FROM python:3.11-slim AS runtime

WORKDIR /app

ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PATH="/install/bin:${PATH}" \
    PYTHONPATH="/install/lib/python3.11/site-packages:${PYTHONPATH}"

# Copy installed dependencies from builder
COPY --from=builder /install /install

# Copy project files
COPY . .

# Create persistent directories with appropriate permissions
RUN mkdir -p data/raw data/interim data/processed reports logs && \
    chmod -R 777 data reports logs

# Default port for Streamlit
EXPOSE 8501

# Healthcheck for Streamlit app
HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8501/_stcore/health')" || exit 1

# Default entrypoint runs Streamlit dashboard
CMD ["streamlit", "run", "app.py", "--server.address=0.0.0.0", "--server.port=8501"]