Update .gitlab-ci.yml

stages:

- publish

cache:

  key: ${CI_COMMIT_REF_SLUG}

  paths:

  - vendor/

update-satis:

  stage: publish

  image: python:3.9

  script:

    - apt-get update && apt-get -y upgrade && apt-get install -y curl

    - apt-get update && apt-get -y upgrade && apt-get -y install curl

    - curl https://gest.unicaen.fr/packagist/update