MINOR: modify when the workflow can trigger

Author: aiharos

.github/workflows/main.yml

@@ -3,15 +3,7 @@
 name: CI
 
 # Controls when the action will run.
-on:
-  # Triggers the workflow on push or pull request events but only for the master branch
-  push:
-    branches: [ master ]
-  pull_request:
-    branches: [ master ]
-
-  # Allows you to run this workflow manually from the Actions tab
-  workflow_dispatch:
+on: [ push, pull_request, workflow_dispatch ]
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs: