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"]

[[runners]]

  name = "gitlab-runner-name"

  request_concurrency = 1

  url = "https://git.url.test/"

  token = "xckaxxxxxxxx"

  executor = "kubernetes"

  environment = ["FF_GITLAB_REGISTRY_HELPER_IMAGE=1"]

​