Dockerfile

# ======================
# Build Stage
# ======================
FROM python:3.12-slim AS builder

WORKDIR /app

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

# Create virtual environment
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Install Python dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt


# ======================
# Production Stage
# ======================
FROM python:3.12-slim AS production

WORKDIR /app

# Install runtime dependencies only
RUN apt-get update && apt-get install -y --no-install-recommends \
    libpq5 \
    curl \
    && rm -rf /var/lib/apt/lists/* \
    && addgroup --system --gid 1001 appgroup \
    && adduser --system --uid 1001 --gid 1001 appuser

# Copy virtual environment from builder
COPY --from=builder /opt/venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Copy application code
COPY --chown=appuser:appgroup . .

# Create staticfiles directory
RUN mkdir -p /app/staticfiles && chown appuser:appgroup /app/staticfiles

# Collect static files
ENV DJANGO_SETTINGS_MODULE=config.settings.production
RUN python manage.py collectstatic --noinput --clear 2>/dev/null || true

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 8000

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

# Default command - run gunicorn
CMD ["gunicorn", "--bind", "0.0.0.0:8000", "--workers", "2", "--threads", "2", "config.wsgi:application"]