Dockerfile

# Use Node.js LTS version
FROM node:20-alpine

# Set working directory
WORKDIR /app

# Copy package files
COPY package*.json ./

# Install dependencies
RUN npm ci --only=production

# Copy application files
COPY . .

# Create a non-root user to run the app
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nodejs -u 1001

# Change ownership of the app directory
RUN chown -R nodejs:nodejs /app

# Switch to the nodejs user
USER nodejs

# Expose port (default 3000, can be overridden)
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
  CMD node -e "require('http').get('http://localhost:' + (process.env.PORT || 3000) + '/health', (res) => process.exit(res.statusCode === 200 ? 0 : 1))"

# Start the application
CMD ["node", "server.js"]