Add Docker support for containerized deployment

.dockerignore

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+# Dependencies
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Build output
+dist/
+build/
+
+# Git
+.git/
+.gitignore
+
+# Environment files
+.env
+.env.*
+!.env.example
+
+# IDE and editor files
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Logs
+logs/
+*.log
+
+# Runtime data
+pids/
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory
+coverage/
+*.lcov
+
+# Temporary folders
+tmp/
+temp/
+
+# Documentation
+docs/
+ai_context/
+README.md
+CONTRIBUTING.md
+CODE_OF_CONDUCT.md
+LICENSE
+SECURITY.md
+
+# Package manager files
+package-lock.json
+.yarn-integrity
+.yarn/
+
+# TypeScript
+*.tsbuildinfo
+
+# Cache
+.cache/
+.parcel-cache/
+.eslintcache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Testing
+test/
+tests/
+__tests__/

Dockerfile

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+# Multi-stage build for Unthread Webhook Server
+
+# Build stage
+FROM node:20-alpine AS builder
+
+# Set working directory
+WORKDIR /app
+
+# Copy package manager files
+COPY package.json yarn.lock .yarnrc ./
+
+# Install all dependencies (including devDependencies for building)
+RUN yarn install --frozen-lockfile --ignore-scripts
+
+# Copy source code and build configuration
+COPY src/ ./src/
+COPY tsconfig.json ./
+
+# Build the TypeScript application
+RUN yarn build
+
+# Production stage
+FROM node:20-alpine AS production
+
+# Set working directory
+WORKDIR /app
+
+# Copy package manager files
+COPY package.json yarn.lock .yarnrc ./
+
+# Set environment to production
+ENV NODE_ENV=production
+# Install only production dependencies
+RUN yarn config set strict-ssl false && \
+    yarn install --frozen-lockfile --production --ignore-scripts && \
+    yarn cache clean
+
+# Copy built application from builder stage
+COPY --from=builder /app/dist ./dist
+
+# Copy environment example (for reference)
+COPY .env.example ./
+
+# Create non-root user for security
+RUN addgroup -g 1001 -S nodejs && \
+    adduser -S nodejs -u 1001
+
+# Change ownership of the app directory to nodejs user
+RUN chown -R nodejs:nodejs /app
+USER nodejs
+
+# Expose the port the app runs on
+EXPOSE 3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD node -e "require('http').get('http://localhost:3000/health', (res) => { process.exit(res.statusCode === 200 ? 0 : 1) }).on('error', () => process.exit(1))"
+
+# Start the application
+CMD ["node", "dist/app.js"]