Flaky tests in nightly builds

[christophfroehlich]

Describe the bug
I open this issue to track CI failures introduced by adding it to the ros-controls stack build.

This error here comes from a typical waiting for service /controller_manager/list_controllers to become available..., maybe we can increase a timeout here, because it succeeds shortly after?

2026-02-27T04:17:27.3889739Z     [spawner-6] [INFO] [1772165737.456962589] [spawner_gripper_controller]: waiting for service /controller_manager/list_controllers to become available...
2026-02-27T04:17:27.3890327Z     FAIL
2026-02-27T04:17:27.3890856Z     test_camera_topics (robot_launch_test.TestFixture.test_camera_topics) ... skipped 'Skipping camera tests in headless mode.'
2026-02-27T04:17:27.3891735Z     test_check_if_msgs_published (robot_launch_test.TestFixture.test_check_if_msgs_published) ... [INFO] [spawner-5]: process has finished cleanly [pid 58859]
2026-02-27T04:17:27.3892333Z     ok
2026-02-27T04:17:27.3893899Z     test_check_if_mujoco_actuators_states_published (robot_launch_test.TestFixture.test_check_if_mujoco_actuators_states_published) ... [spawner-6] [INFO] [1772165737.965991974] [spawner_gripper_controller]: Setting controller param "params_file" to "['/home/runner/work/ros2_control_ci/ros2_control_ci/.work/target_ws/install/mujoco_ros2_control_demos/share/mujoco_ros2_control_demos/config/controllers.yaml']" for gripper_controller
2026-02-27T04:17:27.3895983Z     [spawner-6] [INFO] [1772165737.980787067] [spawner_gripper_controller]: Setting controller param "type" to "position_controllers/JointGroupPositionController" for gripper_controller

2026-02-27T04:17:27.3937256Z     ======================================================================
2026-02-27T04:17:27.3937600Z     FAIL: test_arm (robot_launch_test.TestFixture.test_arm)
2026-02-27T04:17:27.3938026Z     ----------------------------------------------------------------------
2026-02-27T04:17:27.3938345Z     Traceback (most recent call last):
2026-02-27T04:17:27.3939058Z       File "/home/runner/work/ros2_control_ci/ros2_control_ci/.work/target_ws/src/ros-controls/mujoco_ros2_control/mujoco_ros2_control_tests/test/robot_launch_test.py", line 153, in test_arm
2026-02-27T04:17:27.3939814Z         check_controllers_running(self.node, cnames)
2026-02-27T04:17:27.3940625Z       File "/home/runner/work/ros2_control_ci/ros2_control_ci/.work/target_ws/install/controller_manager/lib/python3.12/site-packages/controller_manager/test_utils.py", line 93, in check_controllers_running
2026-02-27T04:17:27.3941400Z         assert all(
2026-02-27T04:17:27.3941578Z                ^^^^
2026-02-27T04:17:27.3942506Z     AssertionError: Controller node(s) not found: ns: /, ctrl:gripper_controller, but seeing [('test_node', '/'), ('mjcf_publisher', '/'), ('robot_state_publisher', '/'), ('controller_manager', '/'), ('mujocosystem', '/'), ('mujoco_node', '/'), ('joint_state_broadcaster', '/'), ('position_controller', '/')]
2026-02-27T04:17:27.3943634Z     
2026-02-27T04:17:27.3943897Z     ======================================================================
2026-02-27T04:17:27.3944259Z     FAIL: test_gripper (robot_launch_test.TestFixture.test_gripper)
2026-02-27T04:17:27.3944640Z     ----------------------------------------------------------------------
2026-02-27T04:17:27.3944956Z     Traceback (most recent call last):
2026-02-27T04:17:27.3945684Z       File "/home/runner/work/ros2_control_ci/ros2_control_ci/.work/target_ws/src/ros-controls/mujoco_ros2_control/mujoco_ros2_control_tests/test/robot_launch_test.py", line 249, in test_gripper
2026-02-27T04:17:27.3946483Z         self.verify_arm_joint_states(
2026-02-27T04:17:27.3947244Z       File "/home/runner/work/ros2_control_ci/ros2_control_ci/.work/target_ws/src/ros-controls/mujoco_ros2_control/mujoco_ros2_control_tests/test/robot_launch_test.py", line 112, in verify_arm_joint_states
2026-02-27T04:17:27.3948013Z         self.assertTrue(
2026-02-27T04:17:27.3948404Z     AssertionError: False is not true : Effort field is zero, PID/Effort reporting may not be working
2026-02-27T04:17:27.3948827Z     
2026-02-27T04:17:27.3949042Z     ----------------------------------------------------------------------

To Reproduce
ros-controls/ros2_control_ci#674