update gitlab-ci

.gitlab-ci.yml

@@ -13,6 +13,13 @@ build-colcon-job:
   stage: build
   script:
   - apt-get update
+  - wget https://github.com/nlohmann/json/archive/refs/tags/v3.11.3.tar.gz
+  - tar -xf v3.11.3.tar.gz
+  - cd json-3.11.3 
+  - mkdir build
+  - cd build
+  - cmake ..
+  - make
   - mkdir -p .src/robossembler-ros2
   - mv * .src/robossembler-ros2
   - mv .git .src/robossembler-ros2