www/gitlab: enable the gitlab secrets scanner in the standard pipeline

This makes it now possible to have a gitlab-runner with shell
and in the pipeline of the repository the default
gitlab pipeline can be used now, like:
include:

• template: Jobs/Secret-Detection.gitlab-ci.yml

(cherry picked from commit 6d9b7f145a6e9638039d91fc03fb79045b3b4dda)