build python version rag-flow (#21)

* clean rust version project

* clean rust version project

* build python version rag-flow

web_server/versions.py

@@ -0,0 +1,30 @@
+#
+#  Copyright 2019 The FATE Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+import os
+
+import dotenv
+import typing
+
+from web_server.utils.file_utils import get_project_base_directory
+
+
+def get_versions() -> typing.Mapping[str, typing.Any]:
+    return dotenv.dotenv_values(
+        dotenv_path=os.path.join(get_project_base_directory(), "rag.env")
+    )
+
+def get_fate_version() -> typing.Optional[str]:
+    return get_versions().get("RAG")