Add some environment output confirmation.

tests/ImageSharp.Tests/TestUtilities/Tests/TestEnvironmentTests.cs

@@ -22,6 +22,9 @@ namespace SixLabors.ImageSharp.Tests
         public TestEnvironmentTests(ITestOutputHelper output)
         {
             this.Output = output;
+
+            this.Output.WriteLine($"Test Environment is CI {TestEnvironment.RunsOnCI}");
+            this.Output.WriteLine($"Test Environment is NET Core. {!string.IsNullOrWhiteSpace(TestEnvironment.NetCoreVersion)}");
         }
 
         private ITestOutputHelper Output { get; }