test(csharp): wait for HTTP readiness in fixture (#3024)

Author: avirajkhare00

foreign/csharp/Iggy_SDK.Tests.Integration/Fixtures/IggyServerFixture.cs

@@ -72,7 +72,11 @@ public IggyServerFixture()
         var builder = new ContainerBuilder(DockerImage)
             .WithPortBinding(3000, true)
             .WithPortBinding(8090, true)
-            .WithWaitStrategy(Wait.ForUnixContainer().UntilInternalTcpPortIsAvailable(8090))
+            .WithWaitStrategy(Wait.ForUnixContainer()
+                .UntilInternalTcpPortIsAvailable(8090)
+                .UntilHttpRequestIsSucceeded(request => request
+                    .ForPort(3000)
+                    .ForPath("/ping")))
             .WithName(_containerId)
             .WithPrivileged(true)
             .WithCleanUp(true);