Also take a look at Cloudron.io. It's not open source, sadly (source is available though), but it's basically what you describe. In terms of automating things

Also take a look at Cloudron.io. It's not open source, sadly (source is available though), but it's basically what you describe. In terms of automating things like handling certs for you, I'd say Caddy or even my own boringproxy.