Add permissions

Author: danbarr

.github/workflows/update-toolhive-reference.yml

@@ -3,6 +3,10 @@ name: Update ToolHive Reference Docs
 on:
   workflow_dispatch:
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   update-reference:
     runs-on: ubuntu-latest