adding platform builds to dotnet/wpf

eng/build.yml

@@ -67,7 +67,7 @@ phases:
         $(_PublishArgs)
         $(_SignArgs)
         $(_OfficialBuildIdArgs)
-        /p:IsShipping=$(_IsShipping) 
+        /p:Platform=$(_Platform) /p:IsShipping=$(_IsShipping) 
       displayName: Windows Build / Publish
       condition: and(succeeded(), eq(variables['Agent.Os'], 'Windows_NT'))
 

eng/pipeline.yml

@@ -19,14 +19,26 @@ phases:
       name: ${{ parameters.agentPool }}
       parallel: 99
       matrix:
-        Build_Debug:
+        Build_Debug_x86:
           _BuildConfig: Debug
           # overwrite some values when building debug
           _PublishType: none
           _SignType: test
           _DotNetPublishToBlobFeed : false
-        Build_Release:
+          _Platform: x86
+        Build_Debug_x64:
+          _BuildConfig: Debug
+          # overwrite some values when building debug
+          _PublishType: none
+          _SignType: test
+          _DotNetPublishToBlobFeed : false
+          _Platform: x64
+        Build_Release_x86:
+          _BuildConfig: Release
+          _Platform: x86
+        Build_Release_x64:
           _BuildConfig: Release
+          _Platform: x64
 
 # only publish build assets if we're running internally
 - ${{ if eq(parameters.runAsPublic, 'false') }}: