Corrige doble reemplazo de variable

variables:

  MAINTENANCE_IMAGE: ${DOCKER_DEPLOY_IMAGE_NAME}:${DOCKER_DEPLOY_IMAGE_TAG}

  STACK: stack

  SERVICE_TO_RUN: ${CI_PROJECT_NAME}

  REGISTRY_URL: ${CI_REGISTRY}

  REGISTRY_USER: ${CI_DEPLOY_USER}

  REGISTRY_PASS: ${CI_DEPLOY_PASSWORD}

  stage: maintenance

  image: ${MAINTENANCE_IMAGE}

  variables:

    SERVICE: ${STACK}_${SERVICE_TO_RUN}

    SERVICE: ${STACK}_${CI_PROJECT_NAME}

  script: relaunch.sh

  only:

    - schedules