fix: tracing fastapi app

Signed-off-by: minatooni <[email protected]>

Author: minatooni

src/instana/instrumentation/fastapi.py

@@ -71,6 +71,8 @@ def init_with_instana(
             kwargs["middleware"] = [Middleware(InstanaASGIMiddleware)]
         elif isinstance(middleware, list):
             middleware.append(Middleware(InstanaASGIMiddleware))
+        elif isinstance(middleware, tuple):
+            kwargs["middleware"] =  (*middleware, Middleware(InstanaASGIMiddleware))
 
         exception_handlers = kwargs.get("exception_handlers")
         if exception_handlers is None: