Add option for symmetric vs GAHM to singularity workflow

[SorooshMani-NOAA]

The option can be specified in coupledmodeldriver as an attribute model in BestTrackForcingJSON:

BestTrackForcingJSON(
    nhc_code=f'{args.name}{args.year}',
    interval_seconds=3600,
    nws=20,
    fort22_filename=workdir/'track_files'/'original.22',
    attributes={'model': 'gahm'}
)

[SorooshMani-NOAA]

@FariborzDaneshvar-NOAA if this works fine please let me know so that I can mark this as done. Thanks!

[FariborzDaneshvar-NOAA]

It worked with the symmetric option, now testing it with gahm too

[FariborzDaneshvar-NOAA]

@FariborzDaneshvar-NOAA if this works fine please let me know so that I can mark this as done. Thanks!

@SorooshMani-NOAA Thanks for adding this feature. I tested the workflow with both pahm_mode options of gahm and symmetric. All good, you can close this ticket.