chore : trying to fix bash syntax

.gitlab/ci/build.gitlab-ci.yml

@@ -31,6 +31,7 @@ build:ubuntu_cpp:
           BRANCH_TO_PULL=${CI_COMMIT_REF_NAME}
       fi
       echo "Pull from branch : ${BRANCH_TO_PULL}"
+
     # Check group namespace is valid, if it is then we are in the official project(aidge group id=6437), otherwise we pull from the fork 
     - >
       set -x