Install diagnostic-updater

Author: aosmw

.github/workflows/test.yml

@@ -37,6 +37,8 @@ jobs:
       run: sudo apt install ros-${{ matrix.ros_distro }}-test-msgs -y
     - name: Install behaviortree_cpp
       run: sudo apt install ros-${{ matrix.ros_distro }}-behaviortree-cpp -y
+    - name: Install diagnostic_updater
+      run: sudo apt install ros-${{ matrix.ros_distro }}-diagnostic-updater -y
     - name: Build and run tests
       id: action-ros-ci
       uses: ros-tooling/[email protected]