feat(docker): add docker support

Dockerfile

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+FROM node:20-alpine
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+EXPOSE 3000
+CMD ["node", "server.js"]

server.js

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+import app from './index.js';
+
+const PORT = process.env.PORT || 3000;
+
+app.listen(PORT, '0.0.0.0', () => {
+  console.log(`Server is running on port ${PORT}`);
+});