GitHub - https://github.com/glincker/levelrail
Levelrail is an open source (Apache 2.0) self-hosted PaaS: a Vercel and Heroku alternative that runs on any Linux server you own, from a small VPS to a rack (the one measured host is a 2 vCPU, 8 GB box). It turns plain servers into a private cloud with Git deploys (forge webhooks), HTTPS (self-signed by default, Let's Encrypt when enabled), databases with verified backups, metrics, logs and alerts, without Kubernetes and without the monitoring stack you would otherwise bolt on.