GitLab CI uses the PHP_CodeSniffer rules used by Drupal core. There is no need to use a phpcs.xml.dist file, now that GitLab CI is enabled for every project.
Since PHPUnit tests are failing as described in #3468407: Add the missing @group annotation to test classes, I would disable them until that issue has been fixed.
Issue fork examples-3500672
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Start within a Git clone of the project using the version control instructions.
Or, if you do not have SSH keys set up on git.drupalcode.org:
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