Feat/environment variables in workflow (#6515)

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

api/core/model_runtime/model_providers/azure_openai/llm/llm.py

@@ -501,7 +501,7 @@ class AzureOpenAILargeLanguageModel(_CommonAzureOpenAI, LargeLanguageModel):
                         sub_messages.append(sub_message_dict)
                 message_dict = {"role": "user", "content": sub_messages}
         elif isinstance(message, AssistantPromptMessage):
-            message = cast(AssistantPromptMessage, message)
+            # message = cast(AssistantPromptMessage, message)
             message_dict = {"role": "assistant", "content": message.content}
             if message.tool_calls:
                 message_dict["tool_calls"] = [helper.dump_model(tool_call) for tool_call in message.tool_calls]