Run unit tests in CI.

[rudolfbyker]

Meh, this wont work, because the test runner is on the AutoActuary organization, and this repo is on the VirtualActuary organization. 🤔

Possible solutions:

• Don't test this repo in CI 🐑
• Make another test runner VM for the VA organization
  • Will probably be underutilized at first.
  • Might run on hv2, which has more capacity.
• Make the VA and AA orgs part of the same GitHub "Enterprise Account"
  • See https://github.blog/changelog/2020-08-05-github-actions-enterprise-runners-and-runner-groups/
  • Admin 🐑
  • Probably costs money.