Answers

1. CMakePresets.json is usually maintained and delivered together with the project, while CMakeUserPresets.json is maintained by the user. Regarding the syntax and the contents, there is no difference.
2. This can be done by calling cmake --preset=presetName, cmake --build --preset=presetName, or ctest --preset=presetName.
3. There are configure, build, package, test, and workflow presets. Build, test, and package presets depend on a configure preset to determine the build directory.
4. A configure preset should define a name, the generator, and the build directory to be used.
5. The first preset to set a value takes precedence.
6. This can be done by either using the native support of an editor for build containers, running the editor from within the container, or starting the container each time to invoke single commands inside.
7. They define the system name, the location of the sysroot, the compilers to use, and how the find_ commands behave.