code: def index_bams(job, config):
      
      job.fileStore.logToMaster('Indexed sample BAMS: ' + config.uuid)
      disk = '1G' if config.ci_test else '20G'
      config.normal_bai = job.addChildJobFn(run_samtools_index, config.normal_bam, cores=1, disk=disk).rv()
      config.tumor_bai = job.addChildJobFn(run_samtools_index, config.tumor_bam, cores=1, disk=disk).rv()
      job.addFollowOnJobFn(preprocessing_declaration, config)
docs: Convenience job for handling bam indexing to make the workflow declaration cleaner
  
      :param JobFunctionWrappingJob job: passed automatically by Toil
      :param Namespace config: Argparse Namespace object containing argument inputs