ci(release): guard PyPI when no PYPI_API_TOKEN

Author: CoderDeltaLAN

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
       - uses: actions/upload-artifact@v4
         with: { name: dist, path: dist/* }
       - name: Publish to PyPI
-        if: startsWith(github.ref, 'refs/tags/v')
+        if: startsWith(github.ref, 'refs/tags/v') && secrets.PYPI_API_TOKEN != ''
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
           user: __token__