how can I add initcontainer to gitlab-runner

CHART VERSION: 0.44.0 APP VERSION: 15.3.0

my helm chart values:

values:
      initContainers:
      - name: mkdir-docker-cert
        image: repo.local/infra/busybox:stable
        command:
        - /bin/sh
        - -c
        - |
          mkdir -p /etc/docker/certs.d/domain-name
          cp /root/.docker/domain-name.crt /etc/docker/certs.d/domain-name

I need create this directory before build container running.