add Digest null value to test scenario that was missed

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

@@ -234,7 +234,7 @@ public async Task TarballsHaveCorrectStructure()
         BuiltImage builtImage = imageBuilder.Build();
 
         // Write the image to disk
-        var sourceReference = new SourceImageReference(registry, DockerRegistryManager.RuntimeBaseImage, DockerRegistryManager.Net7ImageTag);
+        var sourceReference = new SourceImageReference(registry, DockerRegistryManager.RuntimeBaseImage, DockerRegistryManager.Net7ImageTag, null);
         var destinationReference = new DestinationImageReference(new ArchiveFileRegistry(archiveFile), NewImageName(), tags);
 
         return (builtImage, sourceReference, destinationReference);
@@ -1214,11 +1214,7 @@ public async Task CanPackageForAllSupportedContainerRIDs(string dockerPlatform,
         BuiltImage builtImage = imageBuilder.Build();
 
         // Load the image into the local registry
-<<<<<<< HEAD
         var sourceReference = new SourceImageReference(registry, DockerRegistryManager.RuntimeBaseImage, DockerRegistryManager.Net9ImageTag);
-=======
-        var sourceReference = new SourceImageReference(registry, DockerRegistryManager.RuntimeBaseImage, DockerRegistryManager.Net9PreviewImageTag, null);
->>>>>>> 809df5c609 (Add support for using Digest for base image)
         var destinationReference = new DestinationImageReference(registry, NewImageName(), new[] { rid });
         await new DockerCli(_loggerFactory).LoadAsync(builtImage, sourceReference, destinationReference, default).ConfigureAwait(false);