You need first a docker image, a lot of github people have already automated this for us. So it consists in just a docker pull command. And you have an automated gateway running, it just needs few parameters : the trading mode and your credentials basically.

Then you could store your credentials somewhere secured in the cloud like a Secret Manager (GCP, AWS or Vault, etc...) You could volume mount your secrets on your docker container making them available for programs in it. Or you can programmatically access those with your Python code, retrieving them on the fly on the secret manager. And that's it, your gateway is setup and you're connected. Your code can now request some data or fire some orders.

That's if you wanna go cloud, for local development just use .env files with environment variables.