[main] [Release/6.0] Add uploading of intermediate package assets (#59490)

* add uploading of intermediate package assets

* dont push or sign sourcebuild packages in normal leg to avoid duplication

* add comments

Co-authored-by: Anirudh Agnihotry <anagniho@microsoft.com>

Author: github-actions[bot]

eng/pipelines/runtime-official.yml

@@ -332,6 +332,10 @@ stages:
       - SourceBuild_Linux_x64
       jobParameters:
         nameSuffix: SourceBuild
+        extraStepsTemplate: /eng/pipelines/common/upload-intermediate-artifacts-step.yml
+        extraStepsParameters:
+          name: SourceBuildPackages
+      
 
   #
   # Installer Build

src/installer/prepare-artifacts.proj

@@ -122,6 +122,10 @@
         <RelativeBlobPath>$(InstallersRelativePath)workloads/$(SdkBandVersion)/%(Filename)%(Extension)</RelativeBlobPath>
         <PublishFlatContainer>true</PublishFlatContainer>
       </ItemsToPush>
+
+      <!-- Source build intermediated packages will be pushed and signed by the sourcebuild leg. -->
+      <ItemsToPush Remove="@(ItemsToPush)" Condition="$([System.String]::new('%(Identity)').Contains('Microsoft.SourceBuild.Intermediate'))" />
+      <ItemsToSignPostBuild Remove="@(ItemsToSignPostBuild)" Condition="$([System.String]::new('%(Identity)').Contains('Microsoft.SourceBuild.Intermediate'))" />
     </ItemGroup>
 
     <!-- Push items to AzDO as build artifacts, generating the asset manifest as a side effect. -->