yum updateコマンド実行時にBad GPG signatureエラーが発生した原因と対応手順
https://techblog.nhn-techorus.com/archives/28861
PostgreSQL RPM repository GPG key update - 3 January 2024
https://yum.postgresql.org/news/pgdg-rpm-repo-gpg-key-update/
RHEL / Rocky / AlmaLinux 8 - x86_64 : dnf --disablerepo=* -y install https://download.postgresql.org/pub/repos/yum/reporpms/EL-8-x86_64/pgdg-redhat-repo-latest.noarch.rpm