[Auto Sync] Update fused_moe_triton_config.py (20250930) (#11099)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Cheng Wan <54331508+ch-wan@users.noreply.github.com>

python/sglang/srt/layers/moe/fused_moe_triton/fused_moe_triton_config.py

@@ -51,10 +51,14 @@ def get_moe_configs(
 
     # We found that using the fused_moe_kernel config from Triton 3.1.0 with Triton 3.2.0 results in negative performance gains,
     # so we also include the Triton version as a key for finding the fused_moe_kernel config to achieve the best performance.
+    config_dir = os.environ.get(
+        "SGLANG_MOE_CONFIG_DIR", os.path.dirname(os.path.realpath(__file__))
+    )
+
     triton_version = triton.__version__
     version_dir = f"triton_{triton_version.replace('.', '_')}"
     config_file_path = os.path.join(
-        os.path.dirname(os.path.realpath(__file__)),
+        config_dir,
         "configs",
         version_dir,
         json_file_name,
@@ -75,7 +79,7 @@ def get_moe_configs(
         if try_triton_version == triton_version:
             continue
         try_config_file_path = os.path.join(
-            os.path.dirname(os.path.realpath(__file__)),
+            config_dir,
             "configs",
             f"triton_{try_triton_version.replace('.', '_')}",
             json_file_name,