If you are looking for something that is a little more turn-key than this I highly recommend CapRover [0]. I've been using it for years as my POC project PaaS. I haven't yet used it for anything production-facing but I've used it to test out ideas really quickly without having to think about billing (It's on a $20/mo droplet but I used to run it on a $5/mo before I added more projects to it).
I use it to prototype/test ideas quickly, get DB/Api/Client up, running, and publicly accessible (with HTTPS) without much hassle.
It has a number of "one-click" installs for stuff like WP, Jenkins, popular DB's, popular Queues, etc but also supports running docker images (which means PHP/Node/etc support is super easy). There is also multi-host support but I've never personally used that as, again, I use this just for dev and then move to AWS/DO once I have proven it out and I am willing to pay for DB's/EC2 instances.
I'm not affiliated in any way, just someone who likes it.