Refactor upgrade.yml to improve branch syntax

Author: universero

.github/workflows/upgrade.yml

@@ -7,11 +7,12 @@ name: Upgrade
 
 on:
   push:
-    # Publish semver tags as releases.
-    tags: [ 'v*.*.*' ]
-    branches: [ "main" ]
+    branches:
+      - main
   pull_request:
-    branches: [ "main" ]
+    branches:
+      - main
+
 
 env:
   REGISTRY: docker.io