One side note on usage:
When using this unofficial gitlab-runner you will have to explicitly specify a helper image in your config.toml file, e.g.
[runners.docker]
helper_image = “gitlab/gitlab-runner-helper:x86_64-738bbe5a”
…
helper_image = “gitlab/gitlab-runner-helper:x86_64-738bbe5a-servercore1909”
Also see: