fix attribute handling

Author: nagilson

test/Microsoft.NET.Build.Containers.IntegrationTests/CreateNewImageTests.cs

@@ -53,6 +53,7 @@ public void CreateNewImage_Baseline()
 
         task.OutputRegistry = "localhost:5010";
         task.LocalRegistry = DockerAvailableFactAttribute.Attribute.LocalRegistry;
+        task.LocalRegistry = DockerAvailableFactAttribute.LocalRegistry;
         task.PublishDirectory = Path.Combine(newProjectDir.FullName, "bin", "Release", ToolsetInfo.CurrentTargetFramework, "linux-arm64", "publish");
         task.Repository = "dotnet/create-new-image-baseline";
         task.ImageTags = new[] { "latest" };
@@ -199,6 +200,7 @@ public void Tasks_EndToEnd_With_EnvironmentVariable_Validation()
         cni.ContainerRuntimeIdentifier = "linux-x64";
         cni.RuntimeIdentifierGraphPath = ToolsetUtils.GetRuntimeGraphFilePath();
         cni.LocalRegistry = DockerAvailableFactAttribute.Attribute.LocalRegistry;
+        cni.LocalRegistry = DockerAvailableFactAttribute.LocalRegistry;
 
         Assert.True(cni.Execute(), FormatBuildMessages(errors));