Add TestPyPI API token to workflow

Author: julesghub

.github/workflows/publish-to-test-pypi.yaml

@@ -78,3 +78,4 @@ jobs:
       uses: pypa/gh-action-pypi-publish@release/v1
       with:
         repository-url: https://test.pypi.org/legacy/
+        password: ${{ secrets.TEST_PYPI_API_TOKEN }}