Update mac release build to create the nuget.config (#8185)

Update the build definition to create the nuget.config for the gallery modules.

tools/releaseBuild/macOS/vsts.yml

@@ -14,6 +14,15 @@ steps:
     scriptPath: 'tools/releaseBuild/setReleaseTag.sh'
     args: '-ReleaseTag $(ReleaseTagVar) -Variable "ReleaseTagVar"'
   displayName: 'Calculate Release Tag'
+- powershell: |
+   Import-Module $(Build.SourcesDirectory)/build.psm1 -Force
+   New-NugetConfigFile -NugetFeedUrl $(AzDevOpsFeed) -UserName $(AzDevOpsFeedUserName) -ClearTextPAT $(AzDevOpsFeedPAT) -FeedName AzDevOpsFeed -Destination $(Build.SourcesDirectory)/src/Modules
+
+   if(-not (Test-Path "$(Build.SourcesDirectory)/src/Modules/nuget.config"))
+   {
+       throw "nuget.config is not created"
+   }
+  displayName: 'Add nuget.config for AzDevOps feed for PSGallery modules '
 - task: ShellScript@2
   inputs:
     scriptPath: 'tools/installpsh-osx.sh'