Attach multiple files to mail message

action.yml

@@ -33,8 +33,8 @@ inputs:
     description: Content-Type HTTP header (text/html or text/plain)
     required: false
     default: text/plain
-  attach_file:
-    description: File path that will be added to mail message attachments
+  attach_files:
+    description: File paths (separated with comma) that will be added to mail message attachments
     required: false
 runs:
   using: node12