code: public static PipelineConfiguration
      mkInitial(List<String> inputFiles,
                ActionConfiguration configuration,
                AppVersionInfo versionInfo) {
          LightFileDescriptor[] inputDescriptors = inputFiles.stream()
                  .map(f -> LightFileDescriptor.calculate(Paths.get(f))).toArray(LightFileDescriptor[]::new);
          return new PipelineConfiguration(
                  new PipelineStep[] { new PipelineStep(versionInfo, inputDescriptors, configuration) });
      }
docs: Creates initial history