fix : export aidge_install

.gitlab/ci/ubuntu_cpp.gitlab-ci.yml

@@ -30,6 +30,7 @@ include:
     - DEPENDENCY_JOB="$CI_JOB_NAME"
     - !reference [.ubuntu:download:artifacts, script] # located in common.gitlab-ci.yml
     # Build current module
+    - export CMAKE_PREFIX_PATH=$AIDGE_INSTALL
     - echo "Build directory :$BUILD_DIR"
     - mkdir -p $BUILD_DIR
     - echo ${AIDGE_INSTALL/"../"}