add dockerfile

Dockerfile

@@ -0,0 +1,18 @@
+
+FROM node:18-alpine AS builder
+
+WORKDIR /usr/src/app
+
+COPY package*.json ./
+
+RUN npm install --only=production
+
+COPY . .
+
+FROM node:18-alpine
+
+WORKDIR /usr/src/app
+
+COPY --from=builder /usr/src/app .
+EXPOSE 3000
+CMD [ "node", "app.js" ]