Test rspec-puppet jobs on CERN runners

Author: bastelfreak

.github/workflows/ci.yml

@@ -16,3 +16,4 @@ jobs:
     uses: voxpupuli/gha-puppet/.github/workflows/beaker.yml@v1
     with:
       pidfile_workaround: 'false'
+      unit_runs_on: 'cern-self-hosted'

.sync.yml

@@ -1,5 +1,6 @@
 ---
 .github/workflows/ci.yml:
   timeout_minutes: 75
+  unit_runs_on: 'cern-self-hosted'
 spec/spec_helper.rb:
   spec_overrides: "require 'spec_helper_methods'"