How do I employ cache busting in a template?

[Dreamsorcerer]

Discussed in #590

^{Originally posted by ugyballoons July 22, 2022}
Hi,
I'm enjoying working with aiohttp and jinja2.
It's not clear to me how to employ cache busting. Please could someone help?
In the setup I have:

sub_app.add_routes(
    [
        web.static(
            "/static",
            Path(__file__).parent / "static",
            name="static",
            append_version=True,
        ),
    ]
)
sub_app["static_root_url"] = "/path-to/static"
env = aiohttp_jinja2.get_env(sub_app)
env.globals.update(
    zip=zip,
    url_for=web.Resource.url_for
)

and in the template I have:
<link rel="stylesheet" href="{{ url_for('static', filename='stylesheets/main.css') }}">

I feel that I shouldn't be passing url_for in the globals but if I don't, then jinja complains that there's no such function. Where am I going wrong?