code: private List<String> containerEnvStrings() {
      final Map<String, String> env = containerEnv();
      final List<String> envList = Lists.newArrayList();
      for (final Map.Entry<String, String> entry : env.entrySet()) {
        envList.add(entry.getKey() + '=' + entry.getValue());
      }
      return envList;
    }
docs: Compute docker container environment variables.
  
  @return The container environment variables.