Added section to build.yml that builds the pypi package

Author: evaherrada

.github/workflows/build.yml

@@ -55,3 +55,9 @@ jobs:
     - name: Build docs
       working-directory: docs
       run: sphinx-build -E -W -b html . _build/html
+    - name: Build Python package
+      run: |
+        pip install --upgrade setuptools wheel twine readme_renderer testresources
+        python setup.py sdist
+        python setup.py bdist_wheel --universal
+        twine check dist/*