Workaround for WebSPA publish issue

Due to aspnet/websdk #114, dotnet publish only copies to the output directory files which existed before the command was run.

src/Web/WebSPA/WebSPA.csproj

@@ -78,6 +78,13 @@
     <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="1.0.0-msbuild3-final" />
   </ItemGroup>
 
+  <!-- workaround for https://github.com/aspnet/websdk/issues/114 -->
+  <Target Name="AddGeneratedContentItems" BeforeTargets="AssignTargetPaths" DependsOnTargets="PrepareForPublish">
+      <ItemGroup>
+          <Content Include="wwwroot/**" CopyToPublishDirectory="PreserveNewest" Exclude="$(DefaultItemExcludes);$(DefaultExcludesInProjectFolder);@(Content)" />
+      </ItemGroup>
+  </Target>
+
   <ItemGroup>
     <None Update="Dockerfile">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>