Add publish to Test PyPI

Author: jaime-cespedes-sisniega

.github/workflows/publish.yml

@@ -28,8 +28,13 @@ jobs:
       - name: Build package
         run: python -m build
 
+      - name: Publish to Test PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          password: ${{ secrets.TEST_PYPI_API_TOKEN }}
+          repository_url: https://test.pypi.org/legacy/
+
       - name: Publish to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
-          user: __token__
           password: ${{ secrets.PYPI_API_TOKEN }}