/usr/share/sieve/scripts/copy/template.txt is in libkf5ksieve-data 4:17.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | require "copy";
if header :contains "Subject" "foo" {
redirect :copy "other@example.net";
}
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