build(deploy): 更新 Dockerfile镜像源

- 将 ${REGISTRY}/alpine:3.16 替换为 alpine:3.16
- 更新 Alpine Linux 镜像源为清华大学镜像源

deploy/build/Dockerfile

@@ -20,7 +20,7 @@ RUN export GOPROXY=https://goproxy.cn,direct && go mod tidy && go build -ldflags
 RUN mv config /data/app/bin/
 
 
-FROM ${REGISTRY}/alpine:3.16
+FROM alpine:3.16
 RUN set -eux && sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories