Docker container acutronicrobotics/gym-gazebo2 installed, what to do next?

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Hello, I am new to docker

I have installed the docker container by a pull request from https://hub.docker.com/r/acutronicrob.... It got installed correctly as shown below:

duttonide@ubuntu:~$ docker images
REPOSITORY                      TAG                 IMAGE ID            CREATED             SIZE
<none>                          <none>              5415654e5aef        12 hours ago        63.3MB
ubuntu                          bionic              2c047404e52d        3 weeks ago         63.3MB
hello-world                     latest              bf756fb1ae65        11 months ago       13.3kB
acutronicrobotics/gym-gazebo2   latest              b5ccf2feaca5        18 months ago       3.82GB

When I run the docker I get the following errors:

duttonide@ubuntu:~$ docker run -it acutronicrobotics/gym-gazebo2 
root@b47af471b8bf:~/gym-gazebo2# cd ~/ros2learn/experiments/examples/MARA
bash: cd: /root/ros2learn/experiments/examples/MARA: No such file or directory
root@b47af471b8bf:~/gym-gazebo2# python3 train_ppo2_mlp.py
python3: can't open file 'train_ppo2_mlp.py': [Errno 2] No such file or directory
root@b47af471b8bf:~/gym-gazebo2# exit
exit

The official github repo that shows the docker file installation here: https://github.com/AcutronicRobotics/... is quite different.

On trying to install it from here, on running the following code:

cd ~ && git clone -b dashing https://github.com/AcutronicRobotics/ros2learn
cd ~/ros2learn/docker
docker build -t r2l .

I got the following errors:

[0.192s] WARNING:colcon.colcon_ros.prefix_path.catkin:The path 
'home/ros2_example_ws/install/examples_rclcpp_minimal_action_client' in the environment variable 
CMAKE_PREFIX_PATH doesn't exist
--- stderr: composition                         
CMake Error at CMakeLists.txt:133 (find_package):
By not providing "Findlaunch_testing_ament_cmake.cmake" in
CMAKE_MODULE_PATH this project has asked CMake to find a package
configuration file provided by "launch_testing_ament_cmake", but CMake did
not find one.

Could not find a package configuration file provided by
"launch_testing_ament_cmake" with any of the following names:

   launch_testing_ament_cmakeConfig.cmake
   launch_testing_ament_cmake-config.cmake

 Add the installation prefix of "launch_testing_ament_cmake" to
 CMAKE_PREFIX_PATH or set "launch_testing_ament_cmake_DIR" to a directory
 containing one of the above files.  If "launch_testing_ament_cmake"
 provides a separate development package or SDK, be sure it has been
 installed.

Then I followed the solutions suggested here: https://answers.ros.org/question/3304....

The same issue persists may be because the file in the docker should contain all these files which brings me back to the original docker pull, now that I have it what should I do next?

Please help with this. Thanks in advance.