Dockerfile

# Gatekeeper - Production Dockerfile
# Multi-stage build for optimal image size

# =============================================================================
# Stage 1: Builder
# =============================================================================
FROM python:3.12-slim as builder

WORKDIR /build

# 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 backend/requirements.txt .
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# =============================================================================
# Stage 2: Runtime
# =============================================================================
FROM python:3.12-slim as runtime

# Install runtime dependencies only
RUN apt-get update && apt-get install -y --no-install-recommends \
    libpq5 \
    curl \
    && rm -rf /var/lib/apt/lists/* \
    && apt-get clean

# Create non-root user for security
RUN groupadd --gid 1000 gatekeeper && \
    useradd --uid 1000 --gid gatekeeper --shell /bin/bash --create-home gatekeeper

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

# Set working directory
WORKDIR /app

# Copy application code
COPY backend/ ./backend/
COPY .env.example ./.env.example

# Change ownership to non-root user
RUN chown -R gatekeeper:gatekeeper /app

# Switch to non-root user
USER gatekeeper

# Environment variables
ENV PYTHONPATH=/app \
    PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PORT=8000

# Expose port
EXPOSE 8000

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

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