docs: def read_instances(self):
          """
          Read `.dsb/instances.yaml`
          Populates `self.cluster`
          """
          logger.debug('Reading instances from: %s', self.instances_path)
          if os.path.exists(self.instances_path):
              with open(self.instances_path, 'r') as f:
                  list_ = yaml.load(f.read())
                  self.cluster = Cluster.from_list(list_, settings=self.settings)