feat(pipeline-task): 流水线任务日志订阅接口。

src/pipeline-tasks/pipeline-tasks.service.ts

@@ -36,6 +36,10 @@ export class PipelineTasksService {
     return task;
   }
 
+  async findTaskById(id: string) {
+    return await this.repository.findOneOrFail({ id });
+  }
+
   async doNextTask(pipeline: Pipeline) {
     const [lckKey, tasksKey] = this.getRedisTokens(pipeline);
     const redis = this.redis.getClient();