gitlab: try to run parallel steps

.gitlab-ci.yml

@@ -17,7 +17,6 @@
 stages:
   - build
   - deploy
-  - simgrid
 
 build:
   stage: build
@@ -31,7 +30,7 @@ build:
       when: never  # Prevent pipeline run for push event
     - when: always # Run pipeline for all other cases
 
-deploy:
+check:
   stage: deploy
   script:
     - ./contrib/gitlab/deploy.sh
@@ -41,7 +40,7 @@ deploy:
     - when: always # Run pipeline for all other cases
 
 simgrid:
-  stage: simgrid
+  stage: deploy
   script:
     - ./contrib/gitlab/simgrid.sh
   rules: