Update pio.yml

.github/workflows/pio.yml

@@ -1,7 +1,15 @@
 name: PlatformIO CI
 
-on: [push]
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the "main" branch
+  push:
+    # branches: [ "main" ]
+#  pull_request:
+#    branches: [ "main" ]
 
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
 jobs:
   build:
     runs-on: ubuntu-latest