CentOS wiki says that CentOS died at November 30th, 2020.
in tests when we run `yum update` it fails because original package repository is not working anymore:
We don't support CentOS6 in AM7, so for version 7 we should test with centos7 instead or remove that platform test if it is not needed.
For AM 6 we support CentOS 6 so we should fix it and we can as:
All the repos have been archive to https://vault.centos.org/.