Create CI tests for persistent, refreshed database

[lukehesluke]

Create CI tests to ensure that the persistent database approach (created in this PR: #233), including the data refresher, are tested in CI, so that issues can be caught before they release.

This PR contains a very simple test for this: #237.

Recommended test to add to this:

• A similar test, but which also ensures that the IdentityServer works correctly (as this also uses the same SQLite DB)