filename_copy: write "hotfolder_log"

see #68386

server/collection/filename_copy/objects.js

@@ -25,12 +25,24 @@ process.stdin.on('end', () => {
         process.exit(1);
     }
 
+
+    data.hotfolder_log = []
+
     var modified = false
     let col = data?.info?.collection_config?.filename_copy?.filename_target
     if (col) {
         data.objects.forEach((obj, idx) => {
             // set a custom field to the filename of the uploaded file
             obj[obj._objecttype][col] = data?.info?.file?.original_filename || "<no filename>"
+            data.hotfolder_log.push({
+                "path": "path",
+                "file": obj[obj._objecttype][col],
+                "filesize": "filesize",
+                "status": "done",
+                "msg": col+" was set by hotfolder plugin",
+                "asset_id": "123",
+                "system_object_id": "124"
+            })
             modified = true
         })
     }