14.0.15 breaks nextjs in monorepo

[mehranabi]

PR https://github.com/FirebaseExtended/firebase-framework-tools/pull/346 breaks nextjs rollouts in a monorepo setup.

We have our next app at apps/web and the build output is apps/web/.next/standalone but in #346 the adapter only picks root .next/standalone. The build passes successfully but the files are not copied over so the container doesn't run properly and the rollout fails.

The workaround is to add outputFiles manually in apphosting.yml:

outputFiles:
  serverApp:
    include: [.]

the config above copied all files that might make your container to run late for health check, put your real standalone output path instead of .

14.0.13 was ok