Install the NBGV tool that will be used to generate a version number.

azure-pipelines.yml

@@ -12,6 +12,14 @@ variables:
   buildConfiguration: 'Release'
 
 steps:
+- task: DotNetCoreCLI@2  
+  inputs:
+    command: custom
+    custom: tool
+    arguments: install --tool-path . nbgv
+  displayName: Install NBGV tool
+  condition: and(succeeded(), eq(variables['system.pullrequest.isfork'], false))
+
 - task: NuGetToolInstaller@0
 
 - task: NuGetCommand@2
@@ -28,3 +36,4 @@ steps:
   inputs:
     platform: '$(buildPlatform)'
     configuration: '$(buildConfiguration)'
+