Skip EOL operating systems in GHA acceptance tests

With CentOS Linux 7 and CentOS Stream 8 going EOL soon, these will start
to fail because mirrors will no longer be available. This creates an
annotation and skips the OS release.

lib/puppet_metadata/github_actions.rb

@@ -62,6 +62,21 @@ def beaker_os_releases
           yield [os, 'rolling', distro_puppet_version]
         else
           releases&.each do |release|
+            if PuppetMetadata::OperatingSystem.eol?(os, release)
+              message = "Skipping EOL operating system #{os} #{release}"
+
+              if (github_output = ENV.fetch('GITHUB_OUTPUT', nil))
+                File.open(github_output, 'a') do |f|
+                  # TODO: determine file and position within the file
+                  f.write "::warning file=metadata.json::#{message}"
+                end
+              else
+                warn message
+              end
+
+              next
+            end
+
             majors.each do |puppet_version|
               if AIO.has_aio_build?(os, release, puppet_version[:value])
                 yield [os, release, puppet_version]