How to set GitLab runner on k8s, executor Docker not Kubernetes

Question

I'm trying to set GitLab runner on k8s and I want to change the default executor "Kubernetes to "Docker". I did't find even single artice on the internet. What is wrong??

I installed GitLab runner via HelmChart

While installing via helm I used config values.yaml

I tried to change:. executor: kubernetes to executor: docker and

 config: |
    [[runners]]
      [runners.docker]
        namespace = "{{.Release.Namespace}}"
        image = "docker"

in values.yaml but not helped

Error:

I don't know where to change in values.yaml to configure Docker executor

Successfully running on by default Kuberenetes Executor.