Add GitHub Action to Run Pytest on Pull Requests

[ubyndr]

Description:

We should set up a GitHub Action to automatically run pytest on all pull requests. This will help ensure that our test suite is executed for every change, maintaining code quality and preventing regressions.

Tasks:

1. Create a new GitHub Action workflow file in the .github/workflows/ directory.
2. Configure the workflow to trigger on pull requests.
3. Set up the workflow to install dependencies and run pytest.
4. Ensure the results are reported back to the PR.

This will help automate our testing process and improve our CI/CD pipeline.