To change this in your gitlab-runner configuration, depends on the version of your gitlab-runner as described in https://docs.gitlab.com/runner/configuration/feature-flags.html
If you version is 13.9.0 (gitlab-runner –version), then add the following in ~/.gitlab-runner/config.toml
[[runners]] name = "gitlab-runner-name" request_concurrency = 1 url = "https://git.url.test/" token = "xckaxxxxxxxx" executor = "kubernetes" environment = ["FF_GITLAB_REGISTRY_HELPER_IMAGE=1"]