warning 코드
apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8))
apt-key 기능이 deprecated 되면서 직접 파일을 생성해야 함
curl -O https://nginx.org/keys/nginx_signing.key && apt-key add ./nginx_signing.key
#apt-key 조회 및 디렉토리 구조 확인
apt-key list
curl -s https://nginx.org/keys/nginx_signing.key | gpg --no-default-keyring --keyring gnupg-ring:/etc/apt/trusted.gpg.d/erlang.gpg --import
gpg: key ABF5BD827BD9BF62: 3 signatures not checked due to missing keys
gpg: directory '/root/.gnupg' created
gpg: /root/.gnupg/trustdb.gpg: trustdb created
gpg: key ABF5BD827BD9BF62: public key "nginx signing key <signing-key@nginx.com>" imported
gpg: Total number processed: 1
gpg: imported: 1
gpg: no ultimately trusted keys found