CI pipeline's build jobs should cache Composer data
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3483201. -->
Reported by: [phenaproxima](https://www.drupal.org/user/205645)
Related to !147 !446
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>For better CI performance, we should have GitLab cache Composer data between builds, based on the contents of composer.lock.</p>
> Related issue: [Issue #3387117](https://www.drupal.org/node/3387117)
issue