fix #33: setup builds for pull requests

[osdevisnot]

This PR enables build and unit-test for pull requests; see the successfully passing checks below.

[osdevisnot]

@dmoss18 I think we should also run integration tests as a part of every PR as well. The steps to enable that would be:

• Setup Github Secretes for BASE_URL, API_USERNAME, API_PASSWORD and API_ACCOUNT_NUMBER using github settings available to repo owners
• Change the workflow yaml to refer to these secrets in the steps.

More information here: https://docs.github.com/en/actions/learn-github-actions/variables#defining-environment-variables-for-a-single-workflow

Of course this PR doesn't cover that and I can't even create a PR for this since it needs github admin permissions.

Open to feedback on this topic.

[dmoss18]

We've thought about this in the past and I think instead of running the integration tests, we should build out the unit tests with mocked out http responses. The reason is we don't want CI to be making external http requests. We will move those tests into the unit tests folder eventually.

[osdevisnot]

That's fair; I will spend some time on porting some of the tests to unit tests with mocked responses in subsequent MRs.