add Dockerfile for server only

server/Dockerfile

@@ -0,0 +1,16 @@
+FROM node:20 as build
+WORKDIR /app
+COPY nest-cli.json tsconfig*.json package*.json ./
+COPY migrations ./migrations
+COPY src ./src
+RUN npm install
+RUN find src -name "*.spec.ts" -delete
+RUN npm run build
+RUN npm uninstall $(node -e "const fs = require('fs'); const cfg = JSON.parse(fs.readFileSync('package.json',{encoding:'utf-8'})); for (const dep of Object.keys(cfg.devDependencies)) console.log(dep);")
+
+FROM node:20-slim
+WORKDIR /app
+COPY --from=build /app/dist ./dist
+COPY --from=build /app/node_modules ./node_modules
+COPY --from=build /app/package*.json ./
+CMD ["npm", "run", "start:prod"]