feat: proper health-check for github - #10

Non-nullable property 'TopicsRepository' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'DiscourseClient' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'GitHubApiClient' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

'MockHttpMessageHandler.Send(HttpRequestMessage, CancellationToken)' hides inherited member 'HttpMessageHandler.Send(HttpRequestMessage, CancellationToken)'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword.

Consider using the constraint model, Assert.That(actual, Is.EqualTo(expected)), instead of the classic model, Assert.AreEqual(expected, actual) (https://github.com/nunit/nunit.analyzers/tree/master/documentation/NUnit2005.md)

Consider using the constraint model, Assert.That(actual, Is.EqualTo(expected)), instead of the classic model, Assert.AreEqual(expected, actual) (https://github.com/nunit/nunit.analyzers/tree/master/documentation/NUnit2005.md)

Non-nullable property 'TopicsRepository' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'DiscourseClient' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'GitHubApiClient' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.