Set envars to run tests with rmw_zenoh_cpp with multicast discovery (#2776)

Signed-off-by: Alejandro Hernandez Cordero <[email protected]>
Co-authored-by: Yadunund <[email protected]>

Author: ahcorde

rclcpp/test/rclcpp/CMakeLists.txt

@@ -674,6 +674,14 @@ endif()
 function(test_on_all_rmws)
   set(rmw_implementation_env_var RMW_IMPLEMENTATION=${rmw_implementation})
 
+  # If the rmw_implementation is rmw_zenoh_cpp, run the tests with multicast discovery enabled.
+  # Note: This is a temporary change that will be reverted before we branch into Kilted.
+  if(rmw_implementation STREQUAL "rmw_zenoh_cpp")
+    list(APPEND rmw_implementation_env_var
+      ZENOH_CONFIG_OVERRIDE=scouting/multicast/enabled=true
+    )
+  endif()
+
   ament_add_gmock_test(test_qos_event
     TEST_NAME test_qos_event${target_suffix}
     ENV ${rmw_implementation_env_var}