Run build-nextjs for Turbopack test runs on metal machines instead of…

… GitHub hosted runner (vercel#75654)

## What?

All the test runs that happen after this workflow runs are running on
our self hosted runners but the initial setup is running on GitHub's
runner, this causes an environment mismatch that seems to be causing
these errors:

```
  ⚠ Error: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.39' not found (required by /root/actions-runner/_work/next.js/next.js/packages/next-swc/native/next-swc.linux-x64-gnu.node)
      at mod.require (packages/next/dist/server/require-hook.js:65:28)
      at loadNative (packages/next/dist/build/swc/index.js:853:69)
      at <unknown> (packages/next/dist/build/swc/index.js:264:28)
      at new Promise (<anonymous>)
      at loadBindings (packages/next/dist/build/swc/index.js:232:23) {
    code: 'ERR_DLOPEN_FAILED'
  }
```

Going to land this to verify it remedies the problem.

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.github/workflows/setup-nextjs-build.yml

@@ -16,7 +16,11 @@ on:
 jobs:
   build_nextjs:
     name: Build Next.js for the turbopack integration test
-    runs-on: ubuntu-latest-16-core-oss
+    runs-on:
+      - 'self-hosted'
+      - 'linux'
+      - 'x64'
+      - 'metal'
     outputs:
       output1: ${{ steps.build-next-swc-turbopack-patch.outputs.success }}
     steps: