Feat/environment variables in workflow (#6515)

Co-authored-by: JzoNg <jzongcode@gmail.com>

api/tests/unit_tests/configs/test_dify_config.py

@@ -1,3 +1,4 @@
+import os
 from textwrap import dedent
 
 import pytest
@@ -48,7 +49,9 @@ def test_dify_config(example_env_file):
 # This is due to `pymilvus` loading all the variables from the `.env` file into `os.environ`.
 def test_flask_configs(example_env_file):
     flask_app = Flask('app')
-    flask_app.config.from_mapping(DifyConfig(_env_file=example_env_file).model_dump())
+    # clear system environment variables
+    os.environ.clear()
+    flask_app.config.from_mapping(DifyConfig(_env_file=example_env_file).model_dump())  # pyright: ignore
     config = flask_app.config
 
     # configs read from pydantic-settings