No, only the machine where you want Docker to run must be a 64bit arch. Since your Discourse will be running on a server in a datacenter far, far away, your laptop’s arch has nothing to do with it. For a basic Discourse setup, your laptop needs
- a good browser, I’d recommend Firefox or Chrome,
- an SSH client, PuTTY if you’re on Windows,
- an email client, unless you can access your emails through the web.
And that’s it. 