use beta url for release tests

Author: Nabil Freij

.github/workflows/ci.yml

@@ -57,7 +57,7 @@ jobs:
     uses: OpenAstronomy/github-actions-workflows/.github/workflows/publish_pure_python.yml@v1
     with:
       test_extras: 'all,tests'
-      test_command: 'pytest -p no:warnings --doctest-rst -m "not mpl_image_compare" --pyargs hvpy'
+      test_command: 'HELIOVIEWER_API_URL = https://api.beta.helioviewer.org/v2/ pytest -p no:warnings --doctest-rst -m "not mpl_image_compare" --pyargs hvpy'
       submodules: false
     secrets:
       pypi_token: ${{ secrets.pypi_token }}