OpenAPI, tests, and {Ruby on Rails w/ Script.aculo.us built-in back in the day, JS, and rewrite in {Rust, Go,}}? There's dokku-scheduler-kubernetes; and Gitea, a fork of Gogs, which is a github clone in Go; but Gitea doesn't do inbound email to Issues, Service Desk Issues, or (Drone,) CI with deploy to k8s revid.staging and production DNS domains w/ Ingress.