/usr/share/hakyll/templates/atom-item.xml is in libghc-hakyll-dev 4.7.5.1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | <entry>
<title>$title$</title>
<link href="$root$$url$" />
<id>$root$$url$</id>
<published>$published$</published>
<updated>$updated$</updated>
<summary type="html"><![CDATA[$description$]]></summary>
</entry>
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