Removed building docker-compose images on merge requests

.gitlab-ci.yml

@@ -21,11 +21,4 @@ test:
     - cd code/frontend/ && pwd && yarn install --pure-lockfile --cache-folder ../../.yarn && node node_modules/gulp/bin/gulp.js
     - cd ../backend && pwd
     - coverage run setup.py test
-    - coverage report -m
-
-test_docker:
-  stage: test
-  script:
-    - docker-compose build
-  only:
-    - merge_requests
\ No newline at end of file
+    - coverage report -m
\ No newline at end of file