code: def update_buildroot_koji(self, buildroot, output):
          
          docker = output[1]['extra']['docker']
  
          name = ''
          for tag in docker['tags']:
              for repo in docker['repositories']:
                  if tag in repo:
                      iname = ImageName.parse(repo)
                      name = iname.to_str(registry=False)
                      break
  
          buildroot['extra']['osbs']['koji'] = {
              'build_name': name,
              'builder_image_id': docker.get('digests', {})
          }
docs: put the final koji information in the buildroot under extra.osbs