alpine 切换安装源，apk add慢

alpine切换源 安装慢 apk add很慢

阿里镜像

sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories

科大镜像

sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories