Merge pull request #316 from mozilla/revert-311-swap-back-private-worker

Revert "Revert to private worker pool for enterprise macOS."

Author: lissyx

taskcluster/config.yml

@@ -818,7 +818,7 @@ workers:
             worker-type:
                 by-level:
                     '3': '{trust-domain}-3-b-osx-arm64'
-                    default: '{trust-domain}-1-b-osx-arm64'
+                    default: 'gecko-1-b-osx-arm64'
         win10-64-2009-hw:
             provisioner: releng-hardware
             implementation: generic-worker