examples' executable files are not installed by conda

[efekhari27]

The examples' executable files are not found when installing the package on a new environment with conda.

I encountered the following error when running the script run_doe.py from the cantilever_beam example:

  File "/scratch/users/g88077/python_forge/envs/hpc/lib/python3.12/site-packages/othpc/example/cantilever_beam/cantilever_beam.py", line 54, in __init__
    raise ValueError(f"The executable {executable_file} does not exist.")