問題：出現錯誤：Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist
解決方案：我們可以在腳本的頭部增加from的版本
原本：
修改之后：
之后我們就發現構載鏡像成功了！
build dockerfile時出現以下錯誤“Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist”
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