Publish Ngen logs separately

The NGEN log files are published inside our "Build Diagnostic Logs"
container today. That is regularly around 160MB in size of which the
NGEN logs take up ~700K.

Been working on some automation / processing that is specific to NGEN
log files. Downloading the other 159MB is fairly wasteful and slow for
this automation. Publishing the NGEN files separately so I can make this
automation more effecient.

azure-pipelines-official.yml

@@ -145,6 +145,15 @@ jobs:
     continueOnError: true
     condition: succeededOrFailed()
 
+  - task: PublishBuildArtifacts@1
+    displayName: Publish Ngen Logs
+    inputs:
+      PathtoPublish: '$(Build.SourcesDirectory)\artifacts\log\$(BuildConfiguration)\ngen'
+      ArtifactName: 'NGen Logs'
+      publishLocation: Container
+    continueOnError: true
+    condition: succeeded()
+
   - task: PublishTestResults@2
     displayName: Publish xUnit Test Results
     inputs: