Update .gitlab-ci.yml file

.gitlab-ci.yml

-image: gitlab-registry.in2p3.fr/ganilanalysis/docker-acq:master
 #image: gitlab-registry.in2p3.fr/fisvik/docker_vamos:master
 #image: gitlab-registry.in2p3.fr/publications/docker:master
 stages:
     - build
 
-default-job:
+ubuntu20.04:
+  image: gitlab-registry.in2p3.fr/ganilanalysis/docker-acq:master
   stage: build
   script:
     - export ROOTSYS=/opt/root/
@@ -16,3 +16,16 @@ default-job:
     - cmake -DCMAKE_INSTALL_PREFIX=../install ../sources/
     - make -j4
 
+centos7:
+
+image: centos7
+  stage: build
+  script:
+    - export ROOTSYS=/opt/root/
+    - export PATH=$ROOTSYS/bin/:$PATH
+    - export LD_LIBRARY_PATH=$ROOTSYS/lib/:$LD_LIBRARY_PATH
+    - mkdir -p build
+    - mkdir -p install
+    - cd build
+    - cmake -DCMAKE_INSTALL_PREFIX=../install ../sources/
+    - make -j4