[feat] exemONE gitlab-runner environment 추가

contents:
  - DOCKER_CONFIG 환경변수 추가

exemONE/helm/gitlab-runner/override-values.yaml

@@ -22,6 +22,7 @@ runners:
   name: runners
   config: |
     [[runners]]
+      environment = ["DOCKER_CONFIG=/tmp/.docker"]
       [runners.kubernetes]
         namespace = "{{.Release.Namespace}}"
         image = "ubuntu:20.04"