# Dockerfile 示例
# 展示如何构建包含迁移工具的 Go 应用

# ===== 构建阶段 =====
FROM golang:1.21 as builder

WORKDIR /app
COPY go.mod go.sum ./
RUN go mod download

COPY . .

# 编译应用和迁移工具
RUN go build -o bin/server cmd/server/main.go
RUN go build -o bin/migrate cmd/migrate/main.go

# ===== 运行阶段 =====
FROM debian:bookworm-slim

WORKDIR /app

# 安装运行时依赖
RUN apt-get update && apt-get install -y ca-certificates && rm -rf /var/lib/apt/lists/*

# 复制二进制文件和迁移文件
COPY --from=builder /app/bin/server .
COPY --from=builder /app/bin/migrate .
COPY --from=builder /app/migrations ./migrations

EXPOSE 8080

# 启动：先执行迁移，再启动应用
CMD ["sh", "-c", "./migrate up && ./server"]

# 注意：
# 1. 配置文件通过 docker-compose volumes 挂载，不打包进镜像
# 2. 镜像只包含二进制文件和迁移SQL文件
# 3. 配置文件在运行时提供，更安全、更灵活