lint pipe fixes

app/main.py

@@ -0,0 +1,22 @@
+from contextlib import asynccontextmanager
+
+import uvicorn
+from fastapi import FastAPI
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    yield
+
+
+def app_factory():
+    app = FastAPI(lifespan=lifespan)
+    return app
+
+
+def main():
+    uvicorn.run(app_factory, factory=True, host="0.0.0.0", port=8000)
+
+
+if __name__ == "__main__":
+    main()