[FR] demonstrate Next.js example with output: "standalone"

Thanks for putting together the Bazel Next.js example. Next.js support with Bazel is something I have been hoping for for a while.

I haven't found an easy way to deploy the generated artifacts on Vercel though, so I have been exploring open-next as an open-source alternative. Open-next requires building the next.js app though in "standalone" mode as far as I understand and that I have not been able to get to work with Bazel.

I updated the `next.config.js` to

```
/** @type {import('next').NextConfig} */
const nextConfig = {
output: "standalone",
reactStrictMode: true,
swcMinify: true,
// https://nextjs.org/docs/messages/export-image-api
images: {
unoptimized: true,
},
};

module.exports = nextConfig;
```

However when running `bazel build //next.js:next` the build fails with

```
Starting local Bazel server and connecting to it...
INFO: Analyzed target //next.js:next (194 packages loaded, 4178 targets configured).
ERROR: /home/chris/repos/examples/frontend/next.js/BUILD.bazel:21:5: Error while validating output TreeArtifact File:[[]bazel-out/k8-fastbuild/bin]next.js/.next : Failed to resolve relative path standalone/node_modules/is-even inside TreeArtifact /home/chris/.cache/bazel/_bazel_chris/6124436b433d4245c5b38797a7e77c15/execroot/_main/bazel-out/k8-fastbuild/bin/next.js/.next. The associated file is either missing or is an invalid symlink.
ERROR: /home/chris/repos/examples/frontend/next.js/BUILD.bazel:21:5: JsRunBinary next.js/.next failed: not all outputs were created or valid
Target //next.js:next failed to build
Use --verbose_failures to see the command lines of failed build steps.
INFO: Elapsed time: 10.898s, Critical Path: 6.68s
INFO: 29 processes: 4 internal, 1 linux-sandbox, 24 local.
ERROR: Build did NOT complete successfully
```

Can someone point me in the right direction here?

Has anyone found an alternative way to deploy the bazel generated artifacts to either Vecel, AWS or GCP?

Thanks,
Cheers