code: def _register_job(self, key, job_config, logfile, status):
          
          job_details = self._create_job_details(
              key, job_config, logfile, status)
          self.jobs[job_details.fullkey] = job_details
          return job_details
docs: Create a `JobDetails` for this link
          and add it to the self.jobs dictionary.
  
          Parameters
          ----------
  
          key : str
              Key used to identify this particular job
  
          job_config : dict
              Dictionary with arguments passed to this particular job
  
          logfile : str
              Name of the associated log file
  
          status : int
              Current status of the job
  
          Returns
          -------
          job_details : `fermipy.jobs.JobDetails`
              Object with the details about this particular job.