FROM golang:1.24-alpine AS builder

# 安装 UPX
RUN apk add --no-cache upx

WORKDIR /app

# 复制依赖文件
COPY go.mod go.sum ./
RUN go mod download

# 复制代码
COPY . .

# 构建静态链接的二进制文件
RUN go build -ldflags="-s -w" -o server ./cmd \
&& upx -9 server

# alpine:3.19 scratch 最小体积
FROM scratch

WORKDIR /app

# 复制二进制文件
COPY --from=builder /app/server .

# 环境变量
ENV APP_ENV=production

EXPOSE 8080

# 运行服务
CMD ["./server"]