Check https://dokku.com. Easy to set on your VPS, support Heroku buildpacks and almost-zero-to-none management (assuming you update your server from time to time). And you get Heroku-style deployment.
Running some projects with it for the last 5-6 years and had couple of Dokku versions upgrades - zero issues so far.
Keep in mind that depending on use case it will build your project on the same machine your production app runs. There are also a few things to keep in mind.. it depends on docker so a docker update might stop your services, disk space might fill up and needs to be checked on. Plugins such as databases also need to be updated once in a while.
If you're very unlucky you may cause a crash/outage by deploying an update. What I do instead sometimes is to build and push container images of my apps in a pipeline on commit and then deploy those to dokku using git-from.
Running some projects with it for the last 5-6 years and had couple of Dokku versions upgrades - zero issues so far.