Update gitguardian.yml

Author: killshot13

.github/workflows/gitguardian.yml

@@ -2,7 +2,14 @@
 
 name: gitguardian
 # Controls when the workflow will run
-on: [push, pull_request]
+on:
+  # Triggers the workflow on all pull request & push events to the master branch
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
   # This workflow contains a single job named "ggscan"