Dockerfile

# Dockerfile
FROM python:3.12-slim

ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

# Install system dependencies (curl for HEALTHCHECK, build tools if needed)
RUN apt-get update && \
    apt-get install -y --no-install-recommends build-essential curl && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Install python deps
COPY requirements.txt .
RUN pip install --upgrade pip && pip install --no-cache-dir -r requirements.txt

# Copy app
COPY . .

# Create non-root user
RUN useradd --create-home appuser && chown -R appuser /app
USER appuser

EXPOSE 5000

HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
  CMD curl -f http://127.0.0.1:5000/health || exit 1

# Use gunicorn for production
CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:5000", "app:app"]