add docker file

Dockerfile

@@ -0,0 +1,24 @@
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+COPY package*.json ./
+
+RUN npm install
+
+COPY . .
+
+RUN npm run build
+
+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+
+RUN npm install --production
+
+COPY --from=builder /app/dist ./dist
+
+EXPOSE 3000
+CMD [ "node", "dist/index.js" ]