pgdg-common Bad GPG signature

Problem:

Error: Failed to download metadata for repo 'pgdg-common': repomd.xml GPG signature verification error: Bad GPG signature

Solution:

dnf --disablerepo=* -y install https://download.postgresql.org/pub/repos/yum/reporpms/EL-8-x86_64/pgdg-redhat-repo-latest.noarch.rpm
pgdg-redhat-repo-latest.noarch.rpm

Source:
https://yum.postgresql.org/news/pgdg-rpm-repo-gpg-key-update/