docker
https://en.wikipedia.org/wiki/Docker_(software)
https://docs.docker.com
https://docs.docker.com/reference/cli/docker/
https://github.com/moby/moby
container registry
https://hub.docker.com
https://hub.docker.com/_/postgres/tags
podman
https://docs.podman.io/en/latest/index.html
https://github.com/containers/podman