#147 Add GitHub Actions to run Python tests

[sighmon]

Resolves #147

Add GitHub Actions to run the Python tests on code pushes.

Acceptance Criteria

• [x] Add Github Actions to run Python tests

Relevant design files

• None

Testing instructions

1. See that the GitHub Action runs and passes: https://github.com/ACMILabs/media-player/actions

DoD

For requester to complete:

• [x] All acceptance criteria are met
• ~[ ] New logic has been documented~
• ~[ ] New logic has appropriate unit tests~
• ~[ ] Changelog has been updated if necessary~
• ~[ ] Deployment / migration instruction have been updated if required~