Update .gitlab-ci.yml

.gitlab-ci.yml

-before-script:
+before_script:
   - docker info
   - docker-compose -v
 
-build-job:
+build_job:
   stage: build
   script:
     - echo "Hello, $GITLAB_USER_LOGIN!"
 
-test-job1:
+test_job1:
   stage: test
   script:
     - echo "This job tests something"
 
-test-job2:
+test_job2:
   stage: test
   script:
     - echo "This job tests something, but takes more time than test-job1."
@@ -22,7 +22,7 @@ test-job2:
     - which docker-compose
     - sleep 5
 
-deploy-prod:
+deploy_prod:
   stage: deploy
   script:
     - echo "This job deploys something from the $CI_COMMIT_BRANCH branch."