Update .gitlab-ci.yml

.gitlab-ci.yml

 #image: ubuntu:latest
-job1:
+build:latest:
     image: ubuntu:latest
     script:
     - apt update
@@ -9,3 +9,9 @@ job1:
     - ./check_all.sh
     - developer_tools/update_bash_profile.sh ~/.bashrc
     - source ~/.bashrc
+build:xenial:
+    image: ubuntu:xenial
+    script:
+        - apt update
+        - apt install wget sudo
+        - wget -O - https://git.u-cergy.fr/blaar/blaar/raw/master/developer_tools/clone_and_install_blaar_ubuntu.sh | bash
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