Update digger_workflow.yml

Author: jocelo

.github/workflows/digger_workflow.yml

@@ -6,6 +6,13 @@ on:
     types: [ opened, synchronize ]
   issue_comment:
     types: [created]
+  workflow_dispatch:
+    inputs:
+      run_name:
+        required: false
+      spec:
+        description: 'spec input for digger'
+        required: true
 
 jobs:
   plan: