yarnpkg 서명키 업데이트 관련 에러

apt update중 yarn 서명 키 사용 불가 관련에러 처리 방법

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://dl.yarnpkg.com/debian stable InRelease: The following signatures were invalid: EXPKEYSIG 23E7166788B63E1E Yarn Packaging <yarn@dan.cx>
W: Failed to fetch https://dl.yarnpkg.com/debian/dists/stable/InRelease  The following signatures were invalid: EXPKEYSIG 23E7166788B63E1E Yarn Packaging <yarn@dan.cx>
W: Some index files failed to download. They have been ignored, or old ones used instead.

• 서명 키 유효기간 오버된 경우인 듯

wget -qO - https://raw.githubusercontent.com/yarnpkg/releases/gh-pages/debian/pubkey.gpg | sudo apt-key add -

• wget로 새로운 키를 받아 적용합니다.