Add Workers example to patterns

[bensleveritt]

https://discord.com/channels/1139617727565271160/1371088155851100221/1372290802797117644

import { startWorker } from "jazz-nodejs";
import { WorkerAccount } from "./schema";

let jazz: Awaited<ReturnType<typeof startWorker>>;

export const getJazzWorker = async () => {
  if (jazz) {
    console.log("Jazz worker check connection");
    await jazz.waitForConnection();
    console.log("Jazz worker connected");
    return jazz.worker as WorkerAccount;
  }
  console.log("Starting jazz worker");
  const res = await startWorker({
    AccountSchema: WorkerAccount,
    accountID: process.env.JAZZ_ACCOUNT_ID,
    accountSecret: process.env.JAZZ_ACCOUNT_SECRET,
  });

  jazz = res;

  return res.worker as WorkerAccount;
};