团队里很多 Node 项目的镜像动辄 1GB+，整理了一份多阶段构建模板，能压到 200MB 内。
FROM node:20-alpine AS deps
WORKDIR /app
COPY package.json pnpm-lock.yaml ./
RUN corepack enable && pnpm install --frozen-lockfile
FROM node:20-alpine AS build
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN pnpm build
FROM node:20-alpine AS run
WORKDIR /app
ENV NODE_ENV=production
COPY --from=build /app/.next/standalone ./
COPY --from=build /app/.next/static ./.next/static
EXPOSE 3000
CMD ["node", "server.js"]
关键点：用 alpine、生产阶段不带 devDeps、利用 standalone 输出。
大家的镜像都多大？