Wharfie
a modern, docker-like, embedded image builder
...Wharfie uses basically the same syntax, while it is not fully compatible.
While "docker" is focusing on scalable web services, "wharfie" is focusing on embedded linux systems.
With "wharfie" one can easily build a root filesystem, based on the Debian distribution from scratch. He can then configure it in an appropriate way.
Wharfie moved to CODESYS Forge:
https://forge.codesys.com/tol/wharfie