Update .gitlab-ci.yml

.gitlab-ci.yml

-image: registre.unicaen.fr:5000/unicaen-dev-php8.0-apache
-
 stages:
-- tests
 - publish
 
-cache:
-  key: ${CI_COMMIT_REF_SLUG}
-  paths:
-  - vendor/
-
-#unit-tests:
-#  stage: tests
-#  script:
-#    - composer install --no-interaction --no-suggest --no-progress
-#    - php vendor/bin/phpunit --coverage-text=coverage.txt --colors=never
-#  artifacts:
-#    paths:
-#      - coverage.txt
-
 update-satis:
   stage: publish
-  cache: []
+  image: python:3.9
   script:
+    - apt-get update && apt-get -y upgrade && apt-get -y install curl
     - curl https://gest.unicaen.fr/packagist/update
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