Merge branch 'mr_codegen_app' into 'master'

Add exemplary codegen app.

See merge request !1
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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 i10git.cs.fau.de:5005/walberla/buildenvs/gcc:11 with digest i10git.cs.fau.de:5005/walberla/buildenvs/gcc@sha256:810938f45ef234573a6447217eb2d4d186cb8c93d49c495742b6d31687cbc4c2 ...
Cleaning up project directory and file based variables
ERROR: Job failed (system failure): Error response from daemon: failed to create shim: OCI runtime create failed: container_linux.go:380: starting container process caused: process_linux.go:545: container init caused: 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)