fix: Add write permissions to installer workflow for release uploads

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

Author: hydropix

.github/workflows/build-installer.yml

@@ -13,6 +13,9 @@ on:
         required: false
         default: 'dev'
 
+permissions:
+  contents: write
+
 env:
   PYTHON_VERSION: '3.11'