Added missing folder

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

@@ -11,6 +11,7 @@ build:ubuntu_cpp:
     - rm -rf build_cpp
 
     # Build current module
+    - mkdir -p build_cpp
     - cd build_cpp
     - cmake -DCMAKE_INSTALL_PREFIX:PATH=$INSTALL_PATH -DCMAKE_BUILD_TYPE=Debug -DWERROR=ON ..
     - make -j4 all install
@@ -27,7 +28,11 @@ build:ubuntu_python:
     - docker
   script:
     # Download dependencies
-    # aidge_core
+    # aidge_core (CPP)
+    - 'curl --location --output build_artifacts.zip "https://gitlab.eclipse.org/api/v4/projects/5139/jobs/artifacts/main/download?job=build:ubuntu_cpp"'
+    - unzip -o build_artifacts.zip -d .
+    - rm -rf build_cpp
+    # aidge_core (Python)
     - 'curl --location --output build_artifacts.zip "https://gitlab.eclipse.org/api/v4/projects/5139/jobs/artifacts/main/download?job=build:ubuntu_python"'
     - unzip -o build_artifacts.zip -d .