content: # Multi-stage Dockerfile for testing PR #228 migration across Node.js versions
  ARG NODE_VERSION=20
  FROM node:${NODE_VERSION}-alpine
  
  LABEL description="Test environment for PR #228 - Test Suite Migration from Deno to Jest"
  LABEL pr_number="228"
  LABEL test_scope="jest-migration"
  
  # Install system dependencies
  RUN apk add --no-cache \
      git \
      bash \
      python3 \
      make \
      g++ \
      sqlite \
      curl
  
  # Set working directory
  WORKDIR /app
  
  # Copy package files first for better Docker layer caching
  COPY package*.json ./
  COPY jest.config.js ./
  COPY jest.setup.js ./
  COPY tsconfig.json ./
  
  # Install dependencies
  RUN npm ci --no-audit --no-fund
  
  # Copy source code and tests
  COPY src/ ./src/
  COPY tests/ ./tests/
  COPY .claude/ ./.claude/
  
  # Copy other necessary files
  COPY *.md ./
  COPY *.json ./
  
  # Create test directories
  RUN mkdir -p /app/test-results /app/coverage
  
  # Health check script
  RUN echo '#!/bin/bash\nnode --version\nnpm --version\nnpm list jest ts-jest typescript --depth=0\necho "Container ready for testing"' > /app/healthcheck.sh && chmod +x /app/healthcheck.sh
  
  # Set environment variables for testing
  ENV NODE_ENV=test
  ENV CI=true
  ENV JEST_WORKERS=2
  
  # Default command to run tests
  CMD ["npm", "test"]