gitlab-runner exec with dind (docker in docker) minimal working example

Question

This is my .gitlab-ci.yml file:

image: docker:18

varibales:
  DOCKER_DRIVER: "overlay2"
  DOCKER_HOST: tcp://docker:2375

test:
  services:
    - "docker:18-dind"
  script:
    - docker info

I run it with:

gitlab-runner exec docker --docker-privileged --docker-pull-policy if-not-present --docker-tlsverify=false test

and it works.

---

But I want to use current docker version. So I read this documentation.

image: docker:19

varibales:
  DOCKER_TLS_CERTDIR: ""
  DOCKER_DRIVER: "overlay2"
  DOCKER_HOST: tcp://docker:2375

test:
  services:
    - "docker:19-dind"
  script:
    - docker info

I run it with the same as above:

gitlab-runner exec docker --docker-privileged --docker-pull-policy if-not-present --docker-tlsverify=false test

unfortunately this ends with error:

ERROR: Cannot connect to the Docker daemon at tcp://docker:2375. Is the docker daemon running?

I have saw this issue and many others. But I couldn't find a minimal working example that works with gitlab-runner exec docker on every unix system with docker:19 and docker:19-dind

EDIT:
gitlab-runner --version(from Manajaro repo):

Version:      13.0.0
Git revision: HEAD
Git branch:   HEAD
GO version:   go1.14.4
Built:        unknown
OS/Arch:      linux/amd64