How to use the next-server/config.setConfig function in next-server

buildId,
    nextExport: true,
    assetPrefix: nextConfig.assetPrefix.replace(/\/$/, ''),
    distDir,
    dev: false,
    staticMarkup: false,
    hotReloader: null
  }

  const {serverRuntimeConfig, publicRuntimeConfig} = nextConfig

  if (publicRuntimeConfig) {
    renderOpts.runtimeConfig = publicRuntimeConfig
  }

  envConfig.setConfig({
    serverRuntimeConfig,
    publicRuntimeConfig
  })

  // We need this for server rendering the Link component.
  global.__NEXT_DATA__ = {
    nextExport: true
  }

  log(`  launching ${threads} threads with concurrency of ${concurrency} per thread`)
  const exportPathMap = await nextConfig.exportPathMap(defaultPathMap, {dev: false, dir, outDir, distDir, buildId})
  const exportPaths = Object.keys(exportPathMap)

  const progress = !options.silent && createProgress(exportPaths.length)

  const chunks = exportPaths.reduce((result, route, i) => {