alpine 启动没有/bin/bash
docker
alpine软件安装
apk add python3
修改成aliyun源
vi /etc/apk/repositories- https://mirrors.aliyun.com/alpine/
or
sed 命令修改 仓库文件
sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
阿里云镜像源地址：
https://developer.aliyun.com/mirror/