Update coverage.yml

Author: Mark Saroufim

.github/workflows/coverage.yml

@@ -4,13 +4,14 @@ on:
     workflows: ["UnitTests"]
     types:
       - completed
-  workflow_dispatch:
+    # Only trigger on PR events, not pushes to main
+    branches-ignore:
+      - main
 
 jobs:
   test:
     name: Run tests & display coverage
     runs-on: ubuntu-latest
-    # This ensures it ONLY runs on PR events, not pushes to main
     if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success'
     permissions:
       pull-requests: write