code: def containers_running(get_container_name):
      
      running = []
      for n in ['web', 'postgres', 'solr', 'datapusher', 'redis']:
          info = docker.inspect_container(get_container_name(n))
          if info and not info['State']['Running']:
              running.append(n + '(halted)')
          elif info:
              running.append(n)
      return running
docs: Return a list of containers tracked by this environment that are running