docker-compose 掛載的深刻理解，只能掛載文件夾，不能掛載文件啊！！！
Docker mounting rootfs caused not a directory error
You can't mount a file into a directory in docker. That's why you are getting the error.
來源：
https://stackoverflow.com/questions/59697242/docker-mounting-rootfs-caused-not-a-directory-error
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