Mark CentOS 8-like systems as incompatible with CentOS 7
An issue came up for someone came up with someone running on a CentOS 8-like system but not having the OpenSSL 1.0 libs installed: https://mattermost.web.cern.ch/lhcb/channels/davinci/74i9q195dirw7yygfp1g9837zw
Now that running in containers is stable and widely used, should we mark CentOS 7 as being incompatible with CentOS 8 to avoid any debugging time being wasted on these cases?