Add conditional stage to upload the generated nuget package to the UploadPackageToPreReleaseFeed. (#530)

* Evaluate the AzureFunctionsPreReleaseFeed variable and decide whether the generated nuget package will be uploaded to the AzureFunctionsPreReleaseFeed

* Add conditional stage to upload the PowerShell worker nuget package to the AzureFunctionsPreReleaseFeed.

Author: Francisco-Gamino

azure-pipelines.yml

@@ -58,12 +58,31 @@ steps:
       Copy-Item -Path $sourcePath -Destination $(Build.ArtifactStagingDirectory) -ErrorAction Stop -Verbose -Force
   displayName: 'Copy package to ArtifactStagingDirectory'
 
+- pwsh: |
+    $uploadPackage = $null
+    if (-not ([bool]::TryParse($env:UPLOADPACKAGETOPRERELEASEFEED, [ref] $uploadPackage)))
+    {
+      throw "UploadPackageToPreReleaseFeed can only be set to True or False. Current value is set to $env:UPLOADPACKAGETOPRERELEASEFEED"
+    }
+    Write-Host "##vso[task.setvariable variable=UploadPackage]$uploadPackage"
+    Write-Host "UploadPackage: $uploadPackage"
+  displayName: 'Set UploadPackage variable'
+
 - task: NuGetCommand@2
-  condition: and(ne(variables['Build.Reason'], 'PullRequest'), in(variables['Build.SourceBranch'], 'refs/heads/v3.x/ps7', 'refs/heads/v3.x/ps6', 'refs/heads/v2.x'))
+  condition: and(ne(variables['Build.Reason'], 'PullRequest'), in(variables['Build.SourceBranch'], 'refs/heads/v3.x/ps7', 'refs/heads/v3.x/ps6', 'refs/heads/v2.x'), eq(variables.UploadPackage, false))
   inputs:
     command: 'push'
     packagesToPush: '$(Build.ArtifactStagingDirectory)/**/*.nupkg;!$(Build.ArtifactStagingDirectory)/**/*.symbols.nupkg'
     nuGetFeedType: 'internal'
     publishVstsFeed: 'e6a70c92-4128-439f-8012-382fe78d6396/c0493cce-bc63-4e11-9fc9-e7c45291f151'
     allowPackageConflicts: true
   displayName: 'Push NuGet package'
+
+- task: NuGetCommand@2
+  condition: eq(variables.UploadPackage, true)
+  inputs:
+    command: 'push'
+    packagesToPush: '$(Build.ArtifactStagingDirectory)/**/*.nupkg;!$(Build.ArtifactStagingDirectory)/**/*.symbols.nupkg'
+    nuGetFeedType: 'internal'
+    publishVstsFeed: 'e6a70c92-4128-439f-8012-382fe78d6396/f37f760c-aebd-443e-9714-ce725cd427df'
+    allowPackageConflicts: true