Tweak publish workflow. (#785)

Author: davidmorgan

.github/workflows/publish.yaml

@@ -5,13 +5,16 @@ name: Publish
 on:
   pull_request:
     branches: [ master ]
+    types: [opened, synchronize, reopened, labeled, unlabeled]
   push:
     tags: [ '[A-z]+-v[0-9]+.[0-9]+.[0-9]+*' ]
 
 jobs:
   publish:
     if: ${{ github.repository_owner == 'dart-lang' }}
     uses: dart-lang/ecosystem/.github/workflows/publish.yaml@main
+    with:
+      write-comments: false
     permissions:
       pull-requests: write
       id-token: write