fix: grant contents:write permission to release workflow

The default GITHUB_TOKEN has read-only permissions unless a workflow
explicitly requests write access, which caused electron-builder's
--publish step to fail with 403 creating a GitHub Release.

Author: danielcaze

.github/workflows/release.yml

@@ -5,6 +5,9 @@ on:
     tags:
       - 'v*'
 
+permissions:
+  contents: write
+
 jobs:
   release:
     runs-on: windows-latest