Add Node.js manager service and updated docker-compose

manager/Dockerfile

@@ -0,0 +1,14 @@
+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package.json package-lock.json* ./
+RUN npm install
+
+COPY . .
+
+RUN npm run build
+
+ENV PORT=3000
+
+CMD ["npm", "start"]