fix: The local file node of the knowledge base workflow supports MD format (#4487)

Author: shaohuzhang1

ui/src/workflow/nodes/data-source-local-node/index.vue

@@ -93,9 +93,9 @@ import { set } from 'lodash'
 const NodeFormRef = ref()
 const props = defineProps<{ nodeModel: any }>()
 
-const file_type_list_options = ['TXT', 'DOCX', 'PDF', 'HTML', 'XLS', 'XLSX', 'ZIP', 'CSV']
+const file_type_list_options = ['TXT', 'DOCX', 'PDF', 'HTML', 'XLS', 'XLSX', 'ZIP', 'CSV', 'MD']
 const form = {
-  file_type_list: ['TXT', 'DOCX', 'PDF', 'HTML', 'XLS', 'XLSX', 'ZIP', 'CSV'],
+  file_type_list: ['TXT', 'DOCX', 'PDF', 'HTML', 'XLS', 'XLSX', 'ZIP', 'CSV', 'MD'],
   file_size_limit: 100,
   file_count_limit: 50,
 }