Hide the site template starter kit from the installer
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3569329. -->
Reported by: [phenaproxima](https://www.drupal.org/user/205645)
Related to !778
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Our site template starter kit is a bit of a strange beast. It fits the technical criteria for a site template, and therefore visible in the installer, but it's a stub that's meant only for developers. It looks like a weird wart when you see it in the installer.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Per @pameeela in <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/drupal_cms_site_template_base/-/work_items/3568678" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/drupal_cms_site_template_base/-/work_items/3568678</a></span>, hide the starter kit in the installer. Rather than do anything complicated, we'll just special-case it and hide it in the installer theme. We can't do the form alter in the site template selection form, because it runs in the early installer, which doesn't run form alter hooks in the profile.</p>
issue