Configure Integration Tests to use a Fake Data Source on build server

[ardalis]

Currently the integration tests blow up because there is no database to connect to on the build server. Configure them with an alternate data source.

[david-acm]

Hi @ardalis We could use the docker-compose from #1274. There the DB is set as a separate container for local development on Macs. We could either:

• Deploy a SQL container locally using something like https://github.com/marketplace/actions/action-docker-compose. (I haven't used this)
• Or, deploy the SQL container to a cheap pay-as-you-go service like Azure Container Instances we can tear down once the tests run.

[ardalis]

Local docker instance is fine for cross-platform development, I think. For the build server/github actions we can also just designate the agent to use a windows VM (if it isn't already) in which case LocalDB should work fine.