lua: support lua rules

Add lua to the list of keywords that reference files and copy in place.

Ticket: #6395

Author: jasonish

suricata/update/main.py

@@ -97,7 +97,7 @@
 INDEX_EXPIRATION_TIME = 60 * 60 * 24 * 14
 
 # Rule keywords that come with files
-file_kw = ["filemd5", "filesha1", "filesha256", "dataset"]
+file_kw = ["filemd5", "filesha1", "filesha256", "dataset", "lua"]
 
 def strict_error(msg):
     logger.error(msg)