Drupal is moving testing to GitLab CI → . They have provided a base template file for tests.
Add .gitlab-ci.yml file and phpstan.neon for Drupal best practices.
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Issue #3466626 by shelane: Add GitLab CI and apply fixes identified
There are still additional phpstan, and lint issues remaining, but this is a good start. I even believe that one of the spelling errors was a bug.