Publish to test TestPyPI before publishing to PyPI

Author: blink1073

.github/workflows/release-python.yml

@@ -76,6 +76,11 @@ jobs:
         with:
           name: all-dist-${{ github.run_id }}
           path: dist/
+      - name: Publish package distributions to TestPyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository-url: https://test.pypi.org/legacy/
+          skip-existing: true
       - name: Publish package distributions to PyPI
         if: startsWith(inputs.dry_run, 'false')
         uses: pypa/gh-action-pypi-publish@release/v1