Include dll in WinUI3 package

Author: bezysoftware

src/Auth.UI.WinUI3/Auth.UI.WinUI3.csproj

@@ -27,11 +27,24 @@ The library provides a drop-in auth solution that handles the flows for signing
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageId>FirebaseAuthentication.WinUI3</PackageId>
 	<EnableMsixTooling>true</EnableMsixTooling>
+	<TargetsForTfmSpecificBuildOutput>$(TargetsForTfmSpecificBuildOutput);CopyProjectReferencesToPackage</TargetsForTfmSpecificBuildOutput>
   </PropertyGroup>
   <ItemGroup>
     <None Remove="WebAuthenticationBrokerWindow.xaml" />
   </ItemGroup>
 
+  <Target Name="CopyProjectReferencesToPackage" DependsOnTargets="BuildOnlySettings;ResolveReferences">
+    <ItemGroup>
+      <!-- Filter out unnecessary files -->
+      <_ReferenceCopyLocalPaths Include="@(ReferenceCopyLocalPaths->WithMetadataValue('ReferenceSourceTarget', 'ProjectReference')->WithMetadataValue('PrivateAssets', 'All'))"/>
+    </ItemGroup>
+
+    <ItemGroup>
+      <!-- Add file to package with consideration of sub folder. If empty, the root folder is chosen. -->
+      <BuildOutputInPackage Include="@(_ReferenceCopyLocalPaths)" TargetPath="%(_ReferenceCopyLocalPaths.DestinationSubDirectory)"/>
+    </ItemGroup>
+  </Target>
+	
   <ItemGroup>
       <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.3.230602002" />
       <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.756" />