ci: update github action to run on every PR #13

.github/workflows/testPublish.yml

@@ -4,6 +4,7 @@ name: Test and publish
 # events but only for the main branch.
 on:
   push:
+    branches: [ main ]
   pull_request:
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel