While checking a test run on https://dispatcher.drupalci.org/job/drupal8_contrib_patches/162590/console, I noticed we clone Drupal core for each job using just the -b <branch> -v flags. Which appears to take 17 seconds. I suspect we could reduce that time significantly by doing a shallow clone by passing --depth 1 -b <branch> -v instead. It would be nice to cut some CI run time.
I just did a comparison locally on a file:/// clone:
Check https://dispatcher.drupalci.org/job/drupal8_contrib_patches/162590/console
Add --depth 1 to the git clone command on the line that gets executed as sudo -u www-data git clone -v -b 9.5.x https://git.drupalcode.org/project/drupal.git '/var/lib/drupalci/workspace/jenkins-drupal8_contrib_patches-162590/source'
Try it on dispatcher.
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It was fixed but reverted in https://git.drupalcode.org/project/drupalci_testbot/-/commit/a8bf6556002...
Buster has been obsolete since 2021. Composer has changed a lot too. Maybe time to revisit ?