Add .gitlab-ci.yml
Comes from https://git.drupalcode.org/project/gitlab_templates/-/blob/main/gitlab-ci/template.gitlab-ci.yml to run code checkers on the module.
Closes #3437929
Comes from https://git.drupalcode.org/project/gitlab_templates/-/blob/main/gitlab-ci/template.gitlab-ci.yml to run code checkers on the module.
Closes #3437929