Update .gitlab-ci.yml file

.gitlab-ci.yml

 stages:
+stages:
 - build  # section name of the CI pipeline
 - test   # other section executed AFTER 'build'
 
@@ -27,4 +28,5 @@ test_job_2:
   script:
     - echo "Running more tests in group 2..."
     - sleep 5
-    - echo "Testing complete."
\ No newline at end of file
+    - echo "Testing complete."
+  needs: [test_job_1]   # mark this step to be executed AFTER "test_job_1"
\ No newline at end of file