Add SDF_PATH to the environment hooks

- Ensure SDF_PATH is available in the workspace environment.
- Required by the utilities sdformat_urdf and sdf_to_urdf.

Signed-off-by: Rhys Mainwaring <rhys.mainwaring@me.com>

Author: srmainwaring

hooks/ardupilot_gazebo.dsv.in

@@ -1,4 +1,6 @@
-prepend-non-duplicate;GZ_SIM_RESOURCE_PATH;share;@CMAKE_INSTALL_PREFIX@/share
 prepend-non-duplicate;GZ_SIM_RESOURCE_PATH;share/@PROJECT_NAME@/models
 prepend-non-duplicate;GZ_SIM_RESOURCE_PATH;share/@PROJECT_NAME@/worlds
 prepend-non-duplicate;GZ_SIM_SYSTEM_PLUGIN_PATH;lib/@PROJECT_NAME@/
+
+prepend-non-duplicate;SDF_PATH;share/@PROJECT_NAME@/models
+prepend-non-duplicate;SDF_PATH;share/@PROJECT_NAME@/worlds

hooks/ardupilot_gazebo.sh.in

@@ -1,3 +1,6 @@
 ament_prepend_unique_value GZ_SIM_RESOURCE_PATH "$AMENT_CURRENT_PREFIX/share/@PROJECT_NAME@/models"
 ament_prepend_unique_value GZ_SIM_RESOURCE_PATH "$AMENT_CURRENT_PREFIX/share/@PROJECT_NAME@/worlds"
 ament_prepend_unique_value GZ_SIM_PLUGIN_PATH "$AMENT_CURRENT_PREFIX/lib/@PROJECT_NAME@"
+
+ament_prepend_unique_value SDF_PATH "$AMENT_CURRENT_PREFIX/share/@PROJECT_NAME@/models"
+ament_prepend_unique_value SDF_PATH "$AMENT_CURRENT_PREFIX/share/@PROJECT_NAME@/worlds"