Dockerfile

# Multi-stage build for optimization
FROM python:3.13-slim as builder

# Set environment variables for build stage
ENV PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1

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

# Install Python dependencies
COPY requirements.txt .
RUN pip install --user -r requirements.txt

# Production stage
FROM python:3.13-slim

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PATH=/home/appuser/.local/bin:$PATH

# Install runtime dependencies only
RUN apt-get update \
    && apt-get install -y --no-install-recommends \
        postgresql-client \
        libpq5 \
    && rm -rf /var/lib/apt/lists/* \
    && apt-get purge -y --auto-remove

# Create non-root user first
RUN adduser --disabled-password --gecos '' appuser

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

# Set work directory and ownership
WORKDIR /app
RUN chown appuser:appuser /app

# Switch to non-root user
USER appuser

# Copy project files
COPY --chown=appuser:appuser . .

# Collect static files
RUN python manage.py collectstatic --noinput

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
    CMD python manage.py check --deploy || exit 1

# Run the application
CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]