Update Dockerfile

Dockerfile

@@ -1,20 +1,23 @@
 # Alpine v3
-FROM alpine:latest as builder
-LABEL maintainer "fanmingming"
+FROM alpine:3.15 as builder
+LABEL maintainer="fanmingming"
 
 # 安装依赖
-RUN apk update && apk add --no-cache make gcc libc-dev
+RUN apk update && apk add --no-cache make gcc libc-dev wget
 
 # 编译 UDPXY
 WORKDIR /tmp
 RUN wget -O udpxy.tar.gz https://github.com/pcherenkov/udpxy/archive/refs/tags/1.0-25.1.tar.gz \
     && tar zxf udpxy.tar.gz \
-    && cd udpxy-* && make && make install \
-    && rm -rf /tmp/udpxy-*  # 删除源码文件
+    && cd udpxy-* && make && make install
+
+# 删除不必要的文件和包
+RUN apk del make gcc libc-dev wget \
+    && rm -rf /tmp/udpxy-*
 
 # Alpine v3
-FROM alpine:latest
-LABEL maintainer "fanmingming"
+FROM alpine:3.15
+LABEL maintainer="fanmingming"
 
 # Docker 启动
 COPY --from=builder /usr/local/bin/udpxy /usr/local/bin/udpxy