使用阿里镜像 https://mirrors.aliyun.com
sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories 使用科大镜像 http://mirrors.ustc.edu.cn
sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories
链接：https://www.jianshu.com/p/791c91b7c2a4