Fix broken training pipeline

[xcillik]

• The model is not trained & saved during the script run
  • Folder "models" is empty
• Add test(s) to the pipeline that will catch similar errors, stop script execution, and inform the developer about the situation

The error is suggested to occur due to incorrect indentation in the Python script:
https://github.com/Coda-Research-Group/AlphaFind/blob/main/training/alphafind_training/train.py#L97