Move build of preparatory packages into docker image.

.gitlab-ci.yml

@@ -9,13 +9,8 @@ services:
   - docker:dind
 
 build_enabled:
+  image: $base_image_id
   script:
-    - vcs import < instrumentation.repos
-    - vcs import < ci_source_deps.repos
-    - apt-get update
-    - rosdep update
-    - rosdep install --from-paths . --ignore-src --rosdistro dashing -y --skip-keys "console_bridge fastcdr fastrtps libopensplice67 libopensplice69 rti-connext-dds-5.3.1 urdfdom_headers"
-    - apt-get purge -y ros-dashing-fastrtps
     - lttng-sessiond --daemonize
     - colcon build --symlink-install --cmake-args " -DWITH_LTTNG=ON" --packages-up-to $PACKAGES_LIST
     - colcon test --packages-select $PACKAGES_LIST