Listen to XRPL payments: Google Cloud Run container failed to start and listen to the port - websocket

Question

I have an XRP wallet and I'm trying to monitor incoming payments to this address with WebSockets.
My code works fine locally.
After I subscribed to the wallet address, I simply listen to "transaction" events and get the details about the payments made to that address.
But, I need it to run 24/7 on the cloud. Nothing heavy is here. It is simply a single connection running forever.
The problem is, when I deploy my code to Google Cloud Run, I get the following error:
The user-provided container failed to start and listen on the port defined provided by the PORT=8080 environment variable.
So here is my question:
Given that I'm listening to "transactions" via wss://xrplcluster.com/ (with no ports), how should I modify my code to resolve the Cloud Run complain.
Here you are my code and thanks in advance.
import { Client } from 'xrpl';
const client = new Client("wss://xrplcluster.com/");
async function main() {
await client.connect();
const response = await client.request({
command: "subscribe",
accounts: ["my-wallet-address"]
})
client.on("transaction", tx => {
if (tx.validated) {
const transaction = {
amount: tx.transaction.Amount,
from: tx.transaction.Account,
};
console.log(transaction);
}
});
client.on("disconnected", async code => {
console.log(`The wss client is disconnected with code: ${code}`);
await client.connect();
});
}
main();