Second PR to address https://github.com/coder/coder/issues/16230. See
the issue for more context and discussion.
It adds a "Continue with GitHub" button to the `/setup` page, so the
deployment's admin can sign up with it. It also removes the "Username"
and "Full Name" fields to make signing up with email faster. In the
email flow, the username is now auto-generated based on the email, and
full name is left empty.
<img width="1512" alt="Screenshot 2025-02-21 at 17 51 22"
src="https://github.com/user-attachments/assets/e7c6986b-c05e-458b-bb01-c3aea3b74c0e"
/>
There's a separate, follow up issue to visually align the `/setup` page
with the new design system: https://github.com/coder/coder/issues/16653
Using `go run` inside of a test is fragile, because it means we have to
wait for `go` to compile the binary while also constrained on resources
by the fact that Playwright and coderd are already running. We should
instead compile a coder binary for the current platform before the tests
and use it directly.
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