feat: containerize server with Docker

Dockerfile

@@ -0,0 +1,15 @@
+FROM node:20-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN npx tsc
+
+FROM node:20-alpine
+WORKDIR /app
+COPY --from=builder /app/package*.json ./
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/server.js ./
+COPY --from=builder /app/common.js ./
+EXPOSE 1234
+CMD ["node", "server.js"]