code: def get_builder_image_id(self):
          
  
          try:
              buildroot_tag = os.environ["OPENSHIFT_CUSTOM_BUILD_BASE_IMAGE"]
          except KeyError:
              return ''
  
          try:
              pod = self.osbs.get_pod_for_build(self.build_id)
              all_images = pod.get_container_image_ids()
          except OsbsException as ex:
              self.log.error("unable to find image id: %r", ex)
              return buildroot_tag
  
          try:
              return all_images[buildroot_tag]
          except KeyError:
              self.log.error("Unable to determine buildroot image ID for %s",
                             buildroot_tag)
              return buildroot_tag
docs: Find out the docker ID of the buildroot image we are in.