gitlab-ci.yml: use env vars from docker files

rainboard/templates/rainboard/gitlab-ci.yml

 # http://rainboard.laas.fr/project/{{ project.slug }}/.gitlab-ci.yml
 
 variables:
-  GIT_SUBMODULE_STRATEGY: "recursive"
   CCACHE_BASEDIR: "${CI_PROJECT_DIR}"
   CCACHE_DIR: "${CI_PROJECT_DIR}/ccache"
-  CTEST_PARALLEL_LEVEL: 4
 
 cache:
   paths:
@@ -24,7 +22,7 @@ cache:
     - make checkout MASTER_REPOSITORY="git ${CI_PROJECT_DIR}/.git"
     - make install
     - cd $(make show-var VARNAME=WRKSRC)
-{% if project.tests %}    - make test || ctest -VV
+{% if project.tests %}    - make test
 {% endif %}
 {% for image in robotpkg.valid_images %}{{ image.get_job_name }}:
   <<: *robotpkg-{{ robotpkg }}