GitLab Runner pulls an x86-64 helper image, not the arm64 helper image on an arm64 compute host

Summary

gitlab-runner pull x86-64 helper image on arm64 kubernetes executor

Steps to reproduce

start k3s on arm64 linux and register runner by helm

.gitlab-ci.yml

deploy:
  image: minio/mc
  stage: deploy
  variables:
    GIT_STRATEGY: none
  only:
    - master
  script:
    - mc ls
  tags:
    - kubernetes

Actual behavior

gitlab-runner pull gitlab/gitlab-runner-helper:x86_64-54944146 to start helper

Expected behavior

gitlab-runner pull gitlab/gitlab-runner-helper:arm64-54944146 to start helper

Environment description

K3s Host on Armbian 21.02.3 Buster with Linux 5.10.21-rockchip64

k3s version v1.20.5+k3s1 (355fff30)
go version go1.15.10

config.toml contents

Add your configuration here

Used GitLab Runner version

Using Kubernetes executor with image minio/mc ...

Version:      13.10.0
Git revision: 54944146
Git branch:   13-10-stable
GO version:   go1.13.8
Built:        2021-03-21T09:13:25+0000
OS/Arch:      linux/arm64

-->

Possible fixes

set helm value with runners.helpers.image=gitlab/gitlab-runner-helper:arm64-54944146