Feat/environment variables in workflow (#6515)

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

api/core/tools/tool_engine.py

@@ -1,4 +1,5 @@
 import json
+from collections.abc import Mapping
 from copy import deepcopy
 from datetime import datetime, timezone
 from mimetypes import guess_type
@@ -46,7 +47,7 @@ class ToolEngine:
         if isinstance(tool_parameters, str):
             # check if this tool has only one parameter
             parameters = [
-                parameter for parameter in tool.get_runtime_parameters() 
+                parameter for parameter in tool.get_runtime_parameters() or []
                 if parameter.form == ToolParameter.ToolParameterForm.LLM
             ]
             if parameters and len(parameters) == 1:
@@ -123,8 +124,8 @@ class ToolEngine:
         return error_response, [], ToolInvokeMeta.error_instance(error_response)
 
     @staticmethod
-    def workflow_invoke(tool: Tool, tool_parameters: dict,
-                        user_id: str, workflow_id: str, 
+    def workflow_invoke(tool: Tool, tool_parameters: Mapping[str, Any],
+                        user_id: str,
                         workflow_tool_callback: DifyWorkflowCallbackHandler,
                         workflow_call_depth: int,
                         ) -> list[ToolInvokeMessage]:
@@ -141,7 +142,9 @@ class ToolEngine:
             if isinstance(tool, WorkflowTool):
                 tool.workflow_call_depth = workflow_call_depth + 1
 
-            response = tool.invoke(user_id, tool_parameters)
+            if tool.runtime and tool.runtime.runtime_parameters:
+                tool_parameters = {**tool.runtime.runtime_parameters, **tool_parameters}
+            response = tool.invoke(user_id=user_id, tool_parameters=tool_parameters)
 
             # hit the callback handler
             workflow_tool_callback.on_tool_end(