[.github] install rosdep before build

Author: adivardi

.github/workflows/test.yml

@@ -21,6 +21,11 @@ jobs:
     - uses: actions/checkout@v2
     - name: Install Cyclone DDS
       run: sudo apt install ros-${{ matrix.ros_distro }}-rmw-cyclonedds-cpp -y
+    - name: Install dependencies with rosdep
+      run: |
+        rosdep update
+        rosdep install --from-paths src --ignore-src -r -y
+
     - name: Build and run tests
       id: action-ros-ci
       uses: ros-tooling/[email protected]