Dockerfile

# Multi-stage build for optimized Docker image
FROM python:3.11-slim as builder

WORKDIR /app

# Install dependencies
COPY app/requirements.txt .
RUN pip install --no-cache-dir --user -r requirements.txt

# Production stage
FROM python:3.11-slim

WORKDIR /app

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

# Copy application code
COPY app/ .

# Make sure scripts in .local are usable
ENV PATH=/root/.local/bin:$PATH

# Create non-root user
RUN useradd -m -u 1000 appuser && chown -R appuser:appuser /app
USER appuser

# Expose port
EXPOSE 5000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD python -c "import requests; requests.get('http://localhost:5000/')" || exit 1

# Run application
CMD ["gunicorn", "--bind", "0.0.0.0:5000", "--workers", "4", "--timeout", "120", "main:app"]