docker: Use wrangler instead of miniflare

[Christopher Patton]

miniflare.Dockerfile uses miniflare@2.11.0:
https://github.com/cloudflare/daphne/blob/main/docker/miniflare.Dockerfile#L23

We should switch to wrangler@latest, since this is what we actually use in tests.

[Bob Halley]

I have this working on the docker branch now, though I haven't gotten "experimental-local" working yet. It uses pre-compiled stuff so does not cause a rust build at deployment time.

[Christopher Patton]

I suspect we should be good to go as of wrangler 3.

[Bob Halley]

agreed!