customdashboard command doesn't take arguments

[fetzig]

grappelli 3.0.9
django 4.2

According to docs one can add a custom filename/path as arg to the customdashboard command. But that arg doesn't work:

$ python manage.py customdashboard specialname.py
usage: manage.py customdashboard [-h] [--version] [-v {0,1,2,3}] [--settings SETTINGS] [--pythonpath PYTHONPATH] [--traceback] [--no-color] [--force-color] [--skip-checks]
manage.py customdashboard: error: unrecognized arguments: specialname.py

The implementation used in customdashboard.py is unknown to me:

class Command(BaseCommand):
    args = '[file]'

    def handle(self, file=None, **options):
        # ...

Fix would look like this:

class Command(BaseCommand):

    def add_arguments(self, parser):
        parser.add_argument(
            "path",
            nargs="?",  # Makes path argument optional
            type=str,
            default=None,
            help="Defines filepath",
        )

    def handle(self, *args, **options):
        local_path = options["path"]

Obviously one can use the command without args and just copy the file afterwards. Thus removing the extra examples from the docs would fix this as well.

Either way, happy to send a PR (target branch?). Let me know.