fastify.ready fulfills before the Redis connection is established

Prerequisites

[X] I have written a descriptive issue title
[X] I have searched existing issues to ensure the bug has not already been reported

Fastify version

4.10.2

Plugin version

6.1.1

Node.js version

18.18

Operating system

Linux

Operating system version (i.e. 20.04, 11.3, 10)

5.10

Description

How am I supposed to have the server quit in case the Redis server is offline?

Ideally, I'd expect redis.register to block server.ready untl the connection is ready.

server.ts

await fastify.register(redis, { url: fastify.config.REDIS_URL, namespace: "main" /* other redis options */ }).after(err => {
  const { redis } = fastify;
  if (err) {
    fastify.log.error(`Redis connection error: Coult not connect to ${fastify.config.REDIS_URL}`)
    process.exit(1)
  }

})

await fastify.ready();
export default fastify;

index.ts

import server from './server.js'

process.on('unhandledRejection', (err) => {
  console.error(err);
  process.exit(1);
});

const port = +server.config.API_PORT;
const host = server.config.API_HOST;
await server.listen({ host, port }, (err, address) => {

  if(err){
    server.log.error(err)
    process.exit(2)
  }

  server.log.trace(`Server start: [${port}:] ${address}:${port}-${process.pid}/start`);

  // for pm2
  if (process.send != null) {
    process.send('ready');
  }
})

for (const signal of ['SIGINT', 'SIGTERM']) {
  process.on(signal, () =>
    server.close().then((err) => {
      console.log(`close application on ${signal}`);
      process.exit(err ? 1 : 0);
    }),
  );
}

Link to code that reproduces the bug

No response

Expected Behavior