BUG #17003: signature could not be verified for pgdg-common

The following bug has been logged on the website:

Bug reference:      17003
Logged by:          Kushal Gangan
Email address:      kushal.gangan@gmail.com
PostgreSQL version: 10.0
Operating system:   CentOS 7
Description:

Recently https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/
got updated and after that we have started facing below issue:

Failure talking to yum: failure: repodata/repomd.xml from pgdg-common:
[Errno 256] No more mirrors to try.
https://download.postgresql.org/pub/repos/yum/common/redhat/rhel-7-x86_64/repodata/repomd.xml:
[Errno -1] repomd.xml signature could not be verified for pgdg-common"