Gitlab Runner `env` value not evaluated

Summary

When adding new env's to the Gitlab Runners in values.yaml, the env's not add to the register command.

Steps to reproduce

add the following values:

gitlab-runner:
  runners:
    env:
      DOCKER_HOST: tcp://gitlab-dind.gitlab.svc.cluster.local:2375
      DOCKER_DRIVER: overlay

Current behavior

after running helm install we can see that gitlab-gitlab-runner configmap includes:

register-the-runner: "#!/bin/bash\nMAX_REGISTER_ATTEMPTS=30\n\nfor i in $(seq 1
    \"${MAX_REGISTER_ATTEMPTS}\"); do\n  echo \"Registration attempt ${i} of ${MAX_REGISTER_ATTEMPTS}\"\n
    \ /entrypoint register \\\n    --non-interactive\n\n  retval=$?\n\n  if [ ${retval}
    = 0 ]; then\n    break\n  elif [ ${i} = ${MAX_REGISTER_ATTEMPTS} ]; then\n    exit
    1\n  fi\n\n  sleep 5 \ndone\n\nexit 0\n"

the https://gitlab.com/charts/gitlab-runner/blob/master/templates/configmap.yaml#L72 not evaluated...

I tried to download and install only the Gitlab-runner helm chart and its working perfectly.. can someone explain that?

Thanks!

Expected behavior

evaluated statement..