fix : add missing test dep for aidge_core

.gitlab/ci/default.gitlab-ci.yml

@@ -44,6 +44,10 @@ variables:
       fi
     - >
       case $CI_PROJECT_NAME in 
+        "aidge_core" )
+          if [[ "$CI_JOB_NAME" =~ "test.*ubuntu_cpp" ]]; then
+          apt-get install -y -qq git
+        ;;
         "aidge_backend_cuda" )
           apt-get install -y -qq libcudnn8-dev
           # install &configure nvidia container toolkit for cuda repo releases