Docker build 的時候，遇到一直 DNS 查詢錯誤的問題，錯誤訊息如下：
Err:1 http://ftp.tw.debian.org/debian stretch InRelease Temporary failure resolving 'ftp.tw.debian.org' Reading package lists... W: Failed to fetch http://ftp.tw.debian.org/debian/dists/stretch/InRelease Temporary failure resolving 'ftp.tw.debian.org' W: Some index files failed to download. They have been ignored, or old ones used instead.
要怎麼解決呢？