Restore passing --repo to gh @ sigstore job

Author: webknjaz

source/guides/github-actions-ci-cd-sample/publish-to-test-pypi.yml

@@ -79,7 +79,10 @@ jobs:
       # Upload to GitHub Release using the `gh` CLI.
       # `dist/` contains the built packages, and the
       # sigstore-produced signatures and certificates.
-      run: gh release upload "${{ github.ref_name }}" dist/**
+      run: >-
+        gh release upload
+        '${{ github.ref_name }}' dist/**
+        --repo '${{ github.repository }}'
 
   publish-to-testpypi:
     name: Publish Python 🐍 distribution 📦 to TestPyPI