Update azure-pipelines.yml

Updating yaml

azure-pipelines.yml

@@ -10,7 +10,8 @@ pool:
   vmImage: $(imageName)
 
 variables:
-  solution: '**\*.sln;-:**\NCEBulkMigrationTool.sln'
+  solution: '**\*.sln
+  !**\NCEBulkMigrationTool.sln'
   buildPlatform: 'Any CPU'
   buildConfiguration: 'Release'