Merge branch 'mr_codegen_app' into 'master'

Add exemplary codegen app.

See merge request !1
1 job for master in 44 seconds
Name Stage Failure
test Test There has been a runner system failure, please try again
Fetching changes with git depth set to 50...
Initialized empty Git repository in /builds/walberla/example_app/.git/
Created fresh repository.
Checking out e422296b as master...

Skipping Git submodules setup
Executing "step_script" stage of the job script
Using docker image sha256:41d00aeca7cbaab714bb5476b651f526f38e8f5aefd7e33f3a0c2551be4e97cc for with digest ...
Cleaning up project directory and file based variables
ERROR: Job failed (system failure): Error response from daemon: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: error during container init: error running hook #1: error running hook: exit status 1, stdout: , stderr: nvidia-container-cli: requirement error: unsatisfied condition: cuda>=11.6, please update your driver to a newer version, or use an earlier cuda container: unknown (exec.go:73:1s)