Generate Manifests alongside build artifacts (Azure#26280)

* adding artifact manifest before publishing of artifacts

Author: scbedd

eng/pipelines/templates/jobs/ci.yml

@@ -107,6 +107,16 @@ jobs:
           ArtifactPath: '$(Build.ArtifactStagingDirectory)'
           ArtifactName: 'packages'
 
+      - task: AzureArtifacts.manifest-generator-task.manifest-generator-task.ManifestGeneratorTask@0
+        displayName: 'Upload Package SBOM'
+        inputs:
+          BuildDropPath: $(Build.ArtifactStagingDirectory)
+
+      - template: /eng/common/pipelines/templates/steps/publish-artifact.yml
+        parameters:
+          ArtifactPath: '$(Build.ArtifactStagingDirectory)/_manifest'
+          ArtifactName: 'manifest'
+
       - template: /eng/common/pipelines/templates/steps/detect-api-changes.yml
         parameters:
           Artifacts: ${{ parameters.Artifacts }}

eng/pipelines/templates/variables/globals.yml

@@ -14,4 +14,5 @@ variables:
   NUGET_PACKAGES: $(Pipeline.Workspace)/.nuget/packages/
   DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
   DOTNET_CLI_TELEMETRY_OPTOUT: 1
-  DOTNET_NOLOGO: 1
+  DOTNET_NOLOGO: 1
+  Package.EnableSBOMSigning: true