add --dump-sysinfo, a cmd arg to dump limited sysinfo file at startup

def main():

    if args.dump_sysinfo:

        filename = launch_utils.dump_sysinfo()

        print(f"Sysinfo saved as {filename}. Exiting...")

        exit(0)

    launch_utils.startup_timer.record("initial startup")

    with launch_utils.startup_timer.subcategory("prepare environment"):

parser.add_argument("--log-startup", action='store_true', help="launch.py argument: print a detailed log of what's happening at startup")

parser.add_argument("--skip-prepare-environment", action='store_true', help="launch.py argument: skip all environment preparation")

parser.add_argument("--skip-install", action='store_true', help="launch.py argument: skip installation of packages")

parser.add_argument("--dump-sysinfo", action='store_true', help="launch.py argument: dump limited sysinfo file (without information about extensions, options) to disk and quit")

parser.add_argument("--loglevel", type=str, help="log level; one of: CRITICAL, ERROR, WARNING, INFO, DEBUG", default=None)

parser.add_argument("--do-not-download-clip", action='store_true', help="do not download CLIP model even if it's not included in the checkpoint")

parser.add_argument("--data-dir", type=str, default=os.path.dirname(os.path.dirname(os.path.realpath(__file__))), help="base path where all user data is stored")

        webui.api_only()

    else:

        webui.webui()

def dump_sysinfo():

    from modules import sysinfo

    import datetime

    text = sysinfo.get()

    filename = f"sysinfo-{datetime.datetime.utcnow().strftime('%Y-%m-%d-%H-%M')}.txt"

    with open(filename, "w", encoding="utf8") as file:

        file.write(text)

    return filename