Update Dockerfile

Dockerfile

@@ -1,5 +1,5 @@
 # 使用官方Golang镜像
-FROM golang:1.18-alpine AS build
+FROM golang:1.23-alpine AS build
 
 # 安装git
 RUN apk add --no-cache git
@@ -10,6 +10,9 @@ WORKDIR /app
 # 克隆项目仓库
 RUN git clone https://github.com/jianglinzhang/claude2api.git .
 
+# Copy go.mod and go.sum files first for better caching  
+# COPY go.mod go.sum* ./
+
 # 下载依赖
 RUN go mod download