fix(downloadAttachment) filename

ruoyi-flowable/src/main/java/com/ruoyi/flowable/controller/SysAttachmentController.java

@@ -66,7 +66,8 @@ public class SysAttachmentController {
         response.setHeader("content-type", "application/octet-stream");
         response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
         response.setContentType("application/octet-stream");
-        response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=download.zip");
+        String downloadFileName = processInstanceId + "-" + "attachment.zip";
+        response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename="+downloadFileName);
         ZipUtil.zip(response.getOutputStream(), ArrayUtil.toArray(fileNames, String.class), ArrayUtil.toArray(fileInputStreams, FileInputStream.class));
         return null;
     }