Instrument merge request reports artifacts size

app/models/concerns/ci/artifactable.rb

@@ -30,6 +30,8 @@ def each_blob(&blk)
         raise NotSupportedAdapterError, 'This file format requires a dedicated adapter'
       end
 
+      ::Gitlab::ApplicationContext.push(artifact: file.model)
+
       file.open do |stream|
         file_format_adapter_class.new(stream).each_blob(&blk)
       end