Dockerfile

# Multi-stage build for smaller final image
FROM python:3.11-slim AS builder

WORKDIR /build

# Install build dependencies and copy requirements
COPY requirements.txt .

# Install dependencies to user directory for easy copying
RUN pip install --user --no-cache-dir -r requirements.txt

# --- Final Stage ---
FROM python:3.11-slim

# Create non-root user for security
RUN useradd --create-home --shell /bin/bash --uid 1000 appuser

WORKDIR /app

# Copy installed packages from builder
COPY --from=builder /root/.local /home/appuser/.local

# Copy application code
COPY --chown=appuser:appuser app/ ./app/
COPY --chown=appuser:appuser requirements.txt .

# Create runtime directories with correct permissions
RUN mkdir -p /app/data /app/models && \
    chown -R appuser:appuser /app

# Switch to non-root user
USER appuser

# Add local bin to PATH for installed packages
ENV PATH=/home/appuser/.local/bin:$PATH
ENV PYTHONPATH=/app
ENV PYTHONUNBUFFERED=1

# Install curl for healthcheck (as root, then switch back)
USER root
RUN apt-get update && apt-get install -y --no-install-recommends curl && \
    rm -rf /var/lib/apt/lists/* && \
    apt-get clean
USER appuser

# Expose port
EXPOSE 8000

# Healthcheck
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

# Run the application
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]