Imported Upstream version 6.4.0.137

Former-commit-id: 943baa9f16a098c33e129777827f3a9d20da00d6

external/linker/eng/common/templates/post-build/setup-maestro-vars.yml

@@ -0,0 +1,26 @@
+jobs:
+- job: setupMaestroVars
+  displayName: Setup Maestro Vars
+  pool:
+    vmImage: 'windows-2019'
+  steps:
+    - task: DownloadBuildArtifacts@0
+      displayName: Download Release Configs
+      inputs:
+        buildType: current
+        artifactName: ReleaseConfigs
+
+    - task: PowerShell@2
+      name: setReleaseVars
+      displayName: Set Release Configs Vars
+      inputs:
+        targetType: inline
+        script: |
+          . "$(Build.SourcesDirectory)/eng/common/tools.ps1"
+             
+          $BarId = Get-Content "$(Build.StagingDirectory)/ReleaseConfigs/BARBuildId.txt" 
+          Write-PipelineSetVariable -Name 'BARBuildId' -Value $BarId
+           
+          $Channels = ""
+          Get-Content "$(Build.StagingDirectory)/ReleaseConfigs/Channels.txt" | ForEach-Object { $Channels += "$_ ," }
+          Write-PipelineSetVariable -Name 'InitialChannels' -Value "$Channels"