问题：出现错误：Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist
解决方案：我们可以在脚本的头部增加from的版本
原本：
修改之后：
之后我们就发现构载镜像成功了！
build dockerfile时出现以下错误“Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist”
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