gnomeExtensions/update: introduce `--skip-fetch` option

import base64

import json

import logging

import argparse

import subprocess

import urllib.error

import urllib.request

def main() -> None:

    logging.basicConfig(level=logging.DEBUG)

    parser = argparse.ArgumentParser()

    parser.add_argument(

        "--skip-fetch",

        action="store_true",

        help="Skip fetching extensions. When this option is set, the script does not fetch extensions from the internet, but checks for name collisions.",

    )

    args = parser.parse_args()

    if not args.skip_fetch:

        processed_extensions = fetch_extensions()

        serialize_extensions(processed_extensions)