Map "binding.ContainerPort" instead of "binding.Port" to "manifest containerPort" (#740)

src/Microsoft.Tye.Core/CombineStep.cs

@@ -38,7 +38,7 @@ namespace Microsoft.Tye
 
                 if (binding.Protocol == "http")
                 {
-                    var port = binding.Port ?? 80;
+                    var port = binding.ContainerPort ?? binding.Port ?? 80;
                     var urls = $"http://*{(port == 80 ? "" : (":" + port.ToString()))}";
                     project.EnvironmentVariables.Add(new EnvironmentVariableBuilder("ASPNETCORE_URLS") { Value = urls, });
                     project.EnvironmentVariables.Add(new EnvironmentVariableBuilder("PORT") { Value = port.ToString(CultureInfo.InvariantCulture), });

src/Microsoft.Tye.Core/KubernetesManifestGenerator.cs

@@ -183,7 +183,7 @@ namespace Microsoft.Tye
                     port.Add("name", binding.Name ?? binding.Protocol ?? "http");
                     port.Add("protocol", "TCP"); // we use assume TCP. YOLO
                     port.Add("port", binding.Port.Value.ToString());
-                    port.Add("targetPort", binding.Port.Value.ToString());
+                    port.Add("targetPort", (binding.ContainerPort ?? binding.Port.Value).ToString());
                 }
             }
 
@@ -374,7 +374,7 @@ namespace Microsoft.Tye
                         {
                             var containerPort = new YamlMappingNode();
                             ports.Add(containerPort);
-                            containerPort.Add("containerPort", binding.Port.Value.ToString());
+                            containerPort.Add("containerPort", (binding.ContainerPort ?? binding.Port.Value).ToString());
                         }
                     }
                 }