test github action for collectstatic

[ontowhee]

Fix #1831

WIP. This is probably not the right approach. It adds the collectstatic command to tox, although tox is running under development environment and we are trying to test production.

To Do

• Remove jquery.min.map file, then run collectstatic to observe the ValueError.
• Try adding a new step in github actions to .github/workflows/tests.yml, something along the lines of:

            - name: Run collectstatic for production
              run: |
                pip install -r djangoproject/requirements/prod.txt
                python manage.py collectstatic --settings=djangoproject.settings.prod

What environment variables need to be set?