Michal Nowak authored May 04, 2020 and Michał Kępień committed Jun 24, 2020

Pointing to repos in $(CENTOS_MIRROR_BASE_URL)/7/ namespace means using
always the latest CentOS 7 repos (7.8 at this point), even if the install
ISO was CentOS 7.7. A more version-specific repos should be used during
the installation.