Directory.Build.targets

<Project ToolsVersion="15.0">

  <!-- copy pdbs from packages to publish dir -->
  <Target Name="AddPdbsToPublishDir" AfterTargets="ComputeFilesToPublish">
    <ItemGroup>
      <ResolvedFileToPublish
        Include="@(ResolvedFileToPublish->'%(RootDir)%(Directory)%(Filename).pdb')" 
        Condition="Exists('%(RootDir)%(Directory)%(Filename).pdb')">
        <CopyToPublishDirectory>Always</CopyToPublishDirectory>
        <RelativePath>%(Filename).pdb</RelativePath>
      </ResolvedFileToPublish>
    </ItemGroup>
  </Target>

</Project>