添加 Dockerfile

Dockerfile

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+# Dockerfile
+FROM golang:1.25-alpine AS builder
+
+WORKDIR /app
+
+# 复制 go.mod 和源代码
+COPY go.mod ./
+COPY . .
+
+# 编译
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o siteproxy .
+
+# 运行阶段
+FROM alpine:latest
+
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /root/
+
+# 从构建阶段复制二进制文件
+COPY --from=builder /app/siteproxy .
+
+# 暴露端口
+EXPOSE 8080
+
+# 健康检查
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1
+
+# 运行
+CMD ["./siteproxy"]