using kubeconfig.yml

.gitlab-ci.yml

stages:
  - deploy
variables:
  KUBE_CONFIG: "content_of_base64_kubeconfig.yml_goes_here"
deploy_app:
  image: bitnami/kubectl:latest
  stage: deploy
  environment: production
  only:
    - master
  script:
    - echo -n $KUBE_CONFIG | base64 -d > ./config
    - kubectl set image deployment my-app web=${CI_REGISTRY}/user/repo/${CI_PROJECT_PATH_SLUG}:${CI_COMMIT_SHORT_SHA} --kubeconfig ./config --namespace default