Setup automated tests for PRs #155
Description
Right now, PRs don't have any automated checks. (Although, we may soon run Pylint -- see #154.) It would be nice to run some smoke tests (e.g., installing, importing, exercising basic functionality of Memphis.py) to avoid committing bugs. The one may challenge I see to this is that we many need to run an instance of the Memphis broker to facilitate the testing. Some research will need to be done to determine the best way to approach this.
The GitHub actions documentation contains an example for how to run a PostgreSQL container to support an action. This could be adapted to run the Memphis broker containers.