Setting log Debug level works only in code

Bug report

Required Info:

• Operating System:
  • Ubuntu 20.04...)
• Installation type:
  • official foxy docker image
• Version or commit hash:
• DDS implementation: rmw_fastrtps_cpp
• Client library (if applicable):

Steps to reproduce issue

create a ComposableNode

import launch
from launch_ros.actions import ComposableNodeContainer, Node
from launch_ros.descriptions import ComposableNode

def generate_launch_description():
    container = ComposableNodeContainer(
        name="container",
        namespace="",
        package="rclcpp_components",
        executable="component_container",
        composable_node_descriptions=[

            ComposableNode(
                package="localization",
                plugin="LocalizationNode",
                name="localization"
            )
        ],
        arguments=['--ros-args', '--log-level', 'DEBUG'] 
    )

    return launch.LaunchDescription([container])

Expected behavior

The log level is set to debug

Actual behavior

The log level doesn't change

Additional information

There are some topics related to this on answers.ros.org:
https://answers.ros.org/question/311471/selecting-log-level-in-ros2-launch-file/
https://answers.ros.org/question/370288/ros2-how-do-you-set-verbosity-of-a-composable-node/#370389

https://github.com/ros2/launch/issues/383

Setting log level to at least info works fine, setting log level in source code also works:

rcutils_ret_t rcutils_logging_set_logger_level (const char *name, int level);

Feature request

Allow setting Debug severity log.

Start with the provided ComposableNodeContainer launch description and reproduce the behavior using its '--ros-args', '--log-level', 'DEBUG' arguments. Trace how that argument reaches the component container, then verify that the composable node emits debug-level logs when the change is complete.