Embed PDBs for all local builds

Directory.Build.props

@@ -10,6 +10,9 @@
     <AnalysisLevel>latest</AnalysisLevel>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
 
+    <!-- Local builds should embed PDBs so we never lose them when a subsequent build occurs. -->
+    <DebugType Condition=" '$(CI)' != 'true' and '$(TF_BUILD)' != 'true' ">embedded</DebugType>
+
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)\strongname.snk</AssemblyOriginatorKeyFile>