fix: release workflow should only trigger on merge to main

- Remove tag trigger to prevent duplicate releases
- Release workflow now only runs when release PRs are merged
- Follows proper release flow: tag -> PR -> merge -> release

Author: lucaromagnoli

.github/workflows/release.yml

@@ -2,10 +2,8 @@ name: Release
 
 on:
   push:
-    tags:
-      - 'v*.*.*'  # Triggers on semantic version tags like v1.0.0, v2.1.3
     branches:
-      - main  # Trigger when release branches are merged to main
+      - main  # Trigger only when release branches are merged to main
 
 env:
   CMAKE_VERSION: '3.22'