Update instructions for cmake_exercise.md

Author: MakisH

03_building_and_packaging/cmake_exercise.md

@@ -8,7 +8,7 @@ Deadline: **Wednesday, November 26th, 2025, 9:00**
 
 ## Overview
 
-- The goal of the exercise is to open a pull request from a fork of [the CMake exercise repository](https://github.com/Simulation-Software-Engineering/cmake-exercise). Please name your pull request `Add building and container recipes` and assign yourself.
+- The goal of the exercise is to open a pull request from a fork of [the CMake exercise repository](https://github.com/Simulation-Software-Engineering/cmake-exercise). Please name your pull request `Add building and container recipes`.
 - Your pull request should add a `Dockerfile` and a `CMakeLists.txt`, besides some minor changes in `main.cpp`, such as commenting in some code parts.
 - From your pull request, it should be possible to create an executable container. After running the container, it should be possible to `cd` into `cmake-exercise` and then run the `build_and_run.sh` script.
 - Use as many of the currently commented-out additional files, which induce additional dependencies.
@@ -31,7 +31,7 @@ The bare `main.cpp` uses several additions, which are located in the following s
 
 ## Docker Setup
 
-The code and all dependencies should run in a Docker container based on the `ubuntu:24.04` image. As by now, you already know how to set up a basic Docker container, we do no longer provide detailed instructions. We recommend building the Dockerfile incrementally. Start with a rather empty one and install dependencies manually in the interactive mode. Take notes of the commands you use, so you can integrate them into the Dockerfile afterwards and rebuild your image.
+The code and all dependencies should run in a Docker container based on the `ubuntu:24.04` image. As by now, you already know how to set up a basic Docker container, we do no longer provide detailed instructions. We recommend building the Dockerfile incrementally. Start with a rather empty one and install dependencies manually in the interactive mode. Use a copy command instead of setting up a mount. Take notes of the commands you use, so you can integrate them into the Dockerfile afterwards and rebuild your image.
 
 Some standard packages available on Aptitude might come handy:
 
@@ -47,4 +47,4 @@ Add dependencies one by one: Comment in the parts of `main.cpp` that are connect
 
 - Maybe start with the boost dependencies. Boost Container is a header-only dependency, Boost Filesystem needs to be linked. Both are available in `libboost-all-dev`. There is a CMake module to [find boost libraries](https://cmake.org/cmake/help/latest/module/FindBoost.html).
 - deal.II is available in `libdeal.ii-dev`. deal.II uses some specific [CMake macros](https://www.dealii.org/current/users/cmake_user.html).
-- yaml-cpp is an optional bonus task. For some arbitrary reason, we are not happy with the latest release of the software (which would be available through Aptitude), but we want to use exactly version `v0.6.3` [directly from GitHub](https://github.com/jbeder/yaml-cpp/releases/tag/yaml-cpp-0.6.3). Get the sources with [wget](https://linuxize.com/post/wget-command-examples/) and build and install (`make install`) it yourself. Do not forget to add the necessary instructions to the Dockerfile. If libraries in `/usr/local/lib` are not found by CMake, please add the path to the environment variable `LD_LIBRARY_PATH`.
+- yaml-cpp must be built from source. For some arbitrary reason, we are not happy with the latest release of the software (which would be available through Aptitude), but we want to use exactly version `v0.6.3` [directly from GitHub](https://github.com/jbeder/yaml-cpp/releases/tag/yaml-cpp-0.6.3). Get the sources with [wget](https://linuxize.com/post/wget-command-examples/) and build and install (`make install`) it yourself. Do not forget to add the necessary instructions to the Dockerfile. If libraries in `/usr/local/lib` are not found by CMake, please add the path to the environment variable `LD_LIBRARY_PATH`.