scripts/ci: update the gitlab-runner playbook

The upstream install instructions:

  https://docs.gitlab.com/runner/install/linux-repository.html

Now refer to repositories and a setup script. Modernise the playbook
to use the preferred delivery method.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240910173900.4154726-6-alex.bennee@linaro.org>
1 file changed