If you don’t need to scale and you want something simple you might try rolling your own blue/green deployment using nginx or haproxy.
The basic idea is that traffic gets served by nginx or haproxy and forwarded to your app server. When you deploy another app server and background process gets spun up. Then when the new app server is ready you have nginx/haproxy switch where it’s forwarding traffic.
You can do this on a regular vm and skip all the extra tooling.
