How to use the ai2thor.build.platform_map.keys function in ai2thor

def build(context, local=False):
    from multiprocessing import Process
    from ai2thor.build import platform_map

    version = datetime.datetime.now().strftime("%Y%m%d%H%M")
    build_url_base = "http://s3-us-west-2.amazonaws.com/%s/" % S3_BUCKET

    builds = {"Docker": {"tag": version}}
    threads = []
    dp = Process(target=build_docker, args=(version,))
    dp.start()

    for arch in platform_map.keys():
        unity_path = "unity"
        build_name = "thor-%s-%s" % (version, arch)
        build_dir = os.path.join("builds", build_name)
        build_path = build_dir + ".zip"
        build_info = builds[platform_map[arch]] = {}

        build_info["url"] = build_url_base + build_path
        build_info["build_exception"] = ""
        build_info["log"] = "%s.log" % (build_name,)

        _build(unity_path, arch, build_dir, build_name)
        t = threading.Thread(
            target=archive_push, args=(unity_path, build_path, build_dir, build_info)
        )
        t.start()
        threads.append(t)

.strip()
    )
    for i in range(360):
        missing = False
        for arch in platform_map.keys():
            if (i % 5) == 0:
                print("checking %s for commit id %s" % (arch, commit_id))
            if ai2thor.downloader.commit_build_log_exists(arch, commit_id):
                print("log exists %s" % commit_id)
            else:
                missing = True
        if not missing:
            break
        time.sleep(10)

    for arch in platform_map.keys():
        if not ai2thor.downloader.commit_build_exists(arch, commit_id):
            print(
                "Build log url: %s"
                % ai2thor.downloader.commit_build_log_url(arch, commit_id)
            )
            raise Exception("Failed to build %s for commit: %s " % (arch, commit_id))