HTTP endpoint used in tests changed

[radu-matei]

The tests are currently failing because the endpoint we have been using in our tests — https://api.brigade.sh/healthz no longer returns "OK" (but an empty response).

In order for the tests to pass, we either need to update the tests to check for an empty response (which is not ideal, because it does not actually check that the response body is handled correctly), or test a different endpoint.
Any ideas?

I will probably put out a PR to fix the failing tests by updating the expected body, but we should find an endpoint that actually helps test the response body properly.