Surprised nobody else has mentioned the irony of delivering this - a tool designed to help you hand-edit configuration on a pet server - in a container.

"State of the art" doesn't really indicate age. It just means that there's nothing better. I'd be interested in learning about anything that's better than containers.

state of the art /ˌstād ə(v) T͟Hə ˈärt/

phrase of state

the most recent stage in the development of a product, incorporating the newest ideas and the most up-to-date features.

incorporating the newest ideas and the most up-to-date features.

"a new state-of-the-art hospital"

newest =/= new

something can be quite old, but if nothing has replaced it, it's still "newest" and "most up-to-date"

Solaris had zones, which are similar to LXC or OpenVZ, which Linux had almost as long ago. But neither Solaris zones nor LXC/OpenVZ envisioned the sort of container in which this application is being delivered.

(The key insight here is that "containerization" in the modern sense is about norms/expectations/practices and an ecosystem of tooling around a particular design that's convenient for certain use cases; it's not about a technical facility in the OS.)

Delivering applications in chroot/jail had some momentum circa 2003. The tooling was on par with current docker if chosen wisely, but surely not on the level of vagrant/docker-compose/docker swarm/kubernetes.