Sitecore.Extensions/App_Config/Include/zSitecoreExtensions/Unicorn.Configs.PublishItem.config
<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
<sitecore>
<unicorn>
<configurations>
<configuration name="Sitecore.Extensions">
<predicate>
<!-- Content -->
<include name="PublishItem" database="core" path="/sitecore/content/Applications/Content Editor/Context Menues/Default/Publish Item" />
</predicate>
</configuration>
</configurations>
</unicorn>
</sitecore>
</configuration>