Allow opt-in PHP 8.5 testing
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3513062. -->
Reported by: [andypost](https://www.drupal.org/user/118908)
Related to !431 !395
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>There's PHP 8.5 going to core <span class="drupalorg-gitlab-issue-link project-issue-status-info project-issue-status-7"><a href="https://www.drupal.org/project/drupal/issues/3512558" title="Status: Closed (fixed)">#3512558: [CI] Run Unit tests on PHP 8.5 nightly</a></span> and images are rebuild every Friday <span class="drupalorg-gitlab-issue-link project-issue-status-info project-issue-status-7"><a href="https://www.drupal.org/project/drupalci_environments/issues/3512443" title="Status: Closed (fixed)">#3512443: Add a PHP 8.5 image for early testing</a></span></p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>As Drupal core 11.2 released increase <code>CORE_PHP_NEXT</code> to 8.5<br>
PS: contrib's early adopters can use <a href="https://hub.docker.com/r/drupalci/php-8.5-ubuntu-apache/tags">https://hub.docker.com/r/drupalci/php-8.5-ubuntu-apache/tags</a> </p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<p>- wait 11.2 release<br>
- create MR and promote </p>
<h3 id="summary-ui-changes">User interface changes</h3>
<h3 id="summary-api-changes">API changes</h3>
<h3 id="summary-data-model-changes">Data model changes</h3>
> Related issue: [Issue #3512443](https://www.drupal.org/node/3512443)
> Related issue: [Issue #3512558](https://www.drupal.org/node/3512558)
> Related issue: [Issue #3523596](https://www.drupal.org/node/3523596)
> Related issue: [Issue #3557585](https://www.drupal.org/node/3557585)
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