[devops] Don’t build any NuGets if .NET isn’t enabled. (#18823)

tools/devops/automation/templates/build/build-nugets.yml

@@ -30,7 +30,7 @@ steps:
 
 - bash: $(Build.SourcesDirectory)/xamarin-macios/tools/devops/automation/scripts/bash/build-nugets.sh
   displayName: 'Build Nugets'
-  condition: and(succeeded(), contains(variables['configuration.BuildNugets'], 'True'))
+  condition: and(succeeded(), contains(variables['configuration.BuildNugets'], 'True'), ne(variables['ENABLE_DOTNET'],''))
   continueOnError: true # should not stop the build since is not official just yet.
   timeoutInMinutes: 180
 
@@ -48,7 +48,7 @@ steps:
     targetPath: $(Build.SourcesDirectory)/xamarin-macios/_build/nupkgs/bar-manifests
     artifactName: '${{ parameters.uploadPrefix }}AssetManifests'
   continueOnError: true
-  condition: and(succeededOrFailed(), contains(variables['configuration.BuildNugets'], 'True'))
+  condition: and(succeededOrFailed(), contains(variables['configuration.BuildNugets'], 'True'), ne(variables['ENABLE_DOTNET'],''))
 
 - task: PublishPipelineArtifact@1
   displayName: 'Publish Artifact: build-binlogs'
@@ -56,4 +56,4 @@ steps:
     targetPath: $(Build.ArtifactStagingDirectory)/build-binlogs
     artifactName: ${{ parameters.uploadPrefix }}build-binlogs-$(Build.BuildId)-$(System.JobAttempt)
   continueOnError: true
-  condition: and(succeededOrFailed(), contains(variables['configuration.BuildNugets'], 'True'))
+  condition: and(succeededOrFailed(), contains(variables['configuration.BuildNugets'], 'True'), ne(variables['ENABLE_DOTNET'],''))