fix: read store_kv arg from env when using decorator (#5421)

Signed-off-by: Neal Vaidya <nealv@nvidia.com>

lib/bindings/python/src/dynamo/runtime/__init__.py

@@ -36,7 +36,8 @@ def dynamo_worker(enable_nats: bool = True):
         async def wrapper(*args, **kwargs):
             loop = asyncio.get_running_loop()
             request_plane = os.environ.get("DYN_REQUEST_PLANE", "tcp")
-            runtime = DistributedRuntime(loop, "etcd", request_plane, enable_nats)
+            store_kv = os.environ.get("DYN_STORE_KV", "etcd")
+            runtime = DistributedRuntime(loop, store_kv, request_plane, enable_nats)
 
             await func(runtime, *args, **kwargs)