Revert "Don't archive source during build" (#1312)

This reverts commit 314561c7d5b13dc3b2811840927156caf185fc3c.

azure-pipelines/build.yml

@@ -1,4 +1,18 @@
 steps:
+- task: ArchiveFiles@1
+  displayName: 'Archive source '
+  inputs:
+    rootFolder: '$(Build.SourcesDirectory)'
+    includeRootFolder: false
+    archiveType: tar
+    archiveFile: '$(Build.ArtifactStagingDirectory)/source.tar.gz'
+
+- task: PublishBuildArtifacts@1
+  displayName: 'Publish Artifact: source'
+  inputs:
+    PathtoPublish: '$(Build.ArtifactStagingDirectory)/source.tar.gz'
+    ArtifactName: source
+
 - task: UseDotNet@2
   displayName: 'Use defined .NET Core sdk'
   inputs: