ci: add contents write permission to release workflow

Required for uploading assets to GitHub releases

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: raaymax

.github/workflows/release.yml

@@ -13,6 +13,9 @@ on:
 env:
   CARGO_TERM_COLOR: always
 
+permissions:
+  contents: write
+
 jobs:
   build-and-upload:
     name: Build and Upload