inject.js
(window.onload = function() {
setTimeout(function () {
document.getElementById("username").value="<YOUR USER NAME>";
document.getElementById("password").value="<YOUR PASSWORD>";
document.getElementById("signin_form").submit();
}, 1000);
})();
$ nativefier --name "AWS Console" --icon ./aws.icns --inject ./inject.js https://<AWS-account-ID-or-alias>.signin.aws.amazon.com/console