Update of the gitlab-ci script : new docker image and use of the gRaySoftware error code

.gitlab-ci.yml

-image: gitlab-registry.in2p3.fr/ipnl_gamma/ganpro:latest
+image: gitlab-registry.in2p3.fr/ipnl_gamma/docker_gamma:latest
 
 stages:
     - build
@@ -22,7 +22,7 @@ compile:
     - export LD_LIBRARY_PATH=$ROOTSYS/lib/:$LD_LIBRARY_PATH
     - echo "Compilation with ROOT..."
     - echo $PWD
-    - (exit `python scripts/gRaySoftware.py --cmake="-DCMAKE_BUILD_TYPE=debug -- -j 4" --gw= conf compile install | grep "recipe for target" | grep failed | wc -l`)
+    - python scripts/gRaySoftware.py --cmake="-DCMAKE_BUILD_TYPE=debug -- -j 4" --gw= conf compile install
     - cd LYON/gw/
     - mkdir -p cppcheck_output
     - cppcheck --xml --xml-version=2 --enable=style,performance,portability,unusedFunction -i config -i debug -i cmake -i demos -i doc -i doxyfiles -i icons -i macros -i ndb -i scripts . 2> cppcheck_output/output.xml