Change trigger to only run on tag push to master

.github/workflows/github-release.yml

@@ -2,12 +2,12 @@ name: Create GitHub release
 
 on:
   push:
-    branches: [ master ]
     tags:
     - '*.*.*'
 
 jobs:
   release:
+    if: github.event.base_ref == 'refs/heads/master'
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code