docs: public StartTaskRequest withContainerInstances(String... containerInstances) {
          if (this.containerInstances == null) {
              setContainerInstances(new com.amazonaws.internal.SdkInternalList<String>(containerInstances.length));
          }
          for (String ele : containerInstances) {
              this.containerInstances.add(ele);
          }
          return this;
      }