Update digger_workflow.yml

Author: jocelo

.github/workflows/digger_workflow.yml

@@ -6,6 +6,9 @@ on:
       spec:
         description: 'optional digger spec'
         required: false
+      run_name:
+        description: 'optional run name sent by Digger'
+        required: false
   pull_request:
     types: [ opened, synchronize, reopened ]
   issue_comment: