archinstall/examples/creds-sample.json

{
	"!root-password": "<root password>",
	"!users": [
		{
			"username": "<USERNAME>",
			"!password": "<PASSWORD>",
			"sudo": false
		},
		{
			"username": "<SUDO_USERNAME>",
			"!password": "<PASSWORD>",
			"sudo": true
		}
	]
}