Running custom commands with VS Code and CMake Tools

I am using VS Code with the CMake Tools extension, and I would like to run a simple MPI program. Everything compiles just fine, and I can run my code in the terminal using

mpiexec -n 6 "path-to-my-workspace\build\my-executable.exe"

However, I would like to set things up so that this gets executed automatically when I press Control + Shift + P >"CMake: Run Without Debugging" (or Shift F5).

I read in the CMake Tools documentation that I could create new launch targets in a launch.json file. However, the VS Code documentation states that

The launch.json file is used to configure the debugger in Visual Studio Code.

I want this for debug, but also for release. Should I still use a launch.json file? I had the same problem in the past when I needed to pass arguments to my main function. What is the right way to do that in VS Code with CMake Tools?