fix workflow

app/chain/workflow.py

@@ -0,0 +1,22 @@
+from typing import List
+
+from app.chain import ChainBase
+from app.schemas import Workflow
+
+
+class WorkflowChain(ChainBase):
+    """
+    工作流链
+    """
+
+    def process(self, workflow_id: int) -> bool:
+        """
+        处理工作流
+        """
+        pass
+
+    def get_workflows(self) -> List[Workflow]:
+        """
+        获取工作流列表
+        """
+        pass