Update test.yaml

.github/workflows/test.yaml

@@ -1,6 +1,11 @@
 name: GitHub Actions Demo
 run-name: ${{ github.actor }} is testing out GitHub Actions 🚀
-on: [push]
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
 jobs:
   Test-GitHub-Actions:
     runs-on: ubuntu-latest