Use GitHub Actions to test PRs

[MattIPv4]

Website/API Suggestion

Description

All PRs that are submitted to the repo should make use of GitHub Actions to run the test suite.

Things to consider:

• This will need to generate its own config.js
  • Don't want to give it Discord details
  • Will need its own DB details
• This will need its own DB
  • SQLite may be the simplest solution, but it will need to create this with a blank schema before migrations & seed

Why

Whilst most developers will test their code locally before PR'ing, having CI to ensure tests pass on PRs will be useful for reviewers.