add testpypi

Author: blink1073

.github/workflows/release-python.yml

@@ -75,6 +75,12 @@ 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
+        attestations: ${{ env.DRY_RUN }}
     - name: Publish distribution 📦 to PyPI
       if: startsWith(github.ref, 'refs/tags/')
       uses: pypa/gh-action-pypi-publish@release/v1