build package and source before sphinx build

.github/workflows/documentation.yml

@@ -17,10 +17,21 @@ jobs:
         run: |
             sudo apt-get update -qq
             sudo apt-get install -y -qq python3-sphinx doxygen doxygen-gui doxygen-doc graphviz plantuml tree
+            # BUILD PACKAGE
+            . /opt/ros/humble/setup.sh
+            git config --global --add safe.directory '*'
+            git submodule update --init --recursive
+            vcs import . < acados_solver_ros2.repos
+            tree -L 4
+            rosdep install --ignore-src --from-paths . -y -r
+            colcon build
+            colcon build
+            # INSTALL SPHINX PYTHON DEPENDENCIES
             cd ./acados_solver_ros2/
             pip install -r requirements.txt
       - name: Build documentation
         run: |
+            source install/setup.bash
             cd ./acados_solver_ros2
             sphinx-build -b html sphinx sphinx/_build
             cd ../