change gitlab runner, related to #7

    - "shell"

  before_script:

    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" "$CI_REGISTRY"

    - docker buildx create --name ci-builder --use || docker buildx use ci-builder

    - |

      if docker buildx inspect ci-builder >/dev/null 2>&1; then

        docker buildx use ci-builder

      fi

    - docker buildx inspect --bootstrap

    - |

      if [ -n "$CI_COMMIT_TAG" ]; then