# 依赖层——变化频率低，应放在前面
FROM node:18 AS builder
WORKDIR /app
COPY package.json package-lock.json ./    # 只复制依赖文件
RUN npm ci --only=production              # 安装依赖（可缓存）
COPY . .                                  # 复制源码（变化频繁）
RUN npm run build

# 从远程仓库拉取缓存
docker pull registry.example.com/myapp:latest || true

# 使用拉取的镜像作为缓存来源
docker build \
  --cache-from registry.example.com/myapp:latest \
  -t registry.example.com/myapp:${BUILD_TAG} .

# syntax=docker/dockerfile:1
FROM golang:1.21 AS builder
WORKDIR /app
RUN --mount=type=cache,target=/root/.cache/go-build \
    go build -o /app/server .

FROM node:18
WORKDIR /app
RUN --mount=type=cache,target=/root/.npm \
    npm ci

# docker-compose CI 配置
services:
  builder:
    image: node:18
    volumes:
      - npm-cache:/root/.npm
      - .:/app
    working_dir: /app
    command: npm ci && npm run build

volumes:
  npm-cache:

# Stage 1: 依赖安装（低频变化）
FROM node:18 AS deps
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm ci

# Stage 2: 构建（高频变化）
FROM node:18 AS build
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

# Stage 3: 运行（最小镜像）
FROM nginx:alpine
COPY --from=build /app/dist /usr/share/nginx/html