ci: trigger release workflow only on version tags

Remove branch trigger from release workflow to prevent
releases on every main branch push.

Author: trevorbernard

.github/workflows/release.yml

@@ -2,7 +2,6 @@ name: Release
 
 on:
   push:
-    branches: [main]
     tags: ['v*.*.*']
   workflow_run:
     workflows: ["CI"]