ci: add permissions for creating releases in publish workflow

.github/workflows/publish.yml

@@ -20,6 +20,8 @@ jobs:
     needs: check-tests
     runs-on: ubuntu-latest
     if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+    permissions:
+      contents: write  # Required for creating releases
     
     steps:
     - uses: actions/checkout@v4