Dockerfile

# Multi-stage build for BB TPP API Simulator
FROM node:18-alpine AS dependencies

WORKDIR /app

# Copy package files
COPY package.json package-lock.json ./

# Install dependencies
RUN npm ci --only=production && npm cache clean --force

# Runtime stage
FROM node:18-alpine AS runtime

WORKDIR /app

# Create non-root user
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nodejs -u 1001

# Copy dependencies from dependencies stage
COPY --from=dependencies --chown=nodejs:nodejs /app/node_modules ./node_modules

# Copy application code
COPY --chown=nodejs:nodejs package.json ./
COPY --chown=nodejs:nodejs server ./server

# Switch to non-root user
USER nodejs

# Expose port (configurable via PORT env var, default 8080)
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD node -e "require('http').get('http://localhost:${PORT:-8080}/api/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"

# Start the application
CMD ["npm", "start"]