The installer should allow site templates to scaffold files
>>> [!note] Migrated issue
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Reported by: [phenaproxima](https://www.drupal.org/user/205645)
Related to !835
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>In some situations, it may make sense for a site template to scaffold additional files into the project. An example would be an AGENTS.md in the project root -- a site template should ship a default version that has information for agents on how to work with that particular site template.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>The installer should automatically add the site template to the allow-list of scaffold packages.</p>
issue