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Re:CoreOS is building a container runtime, Rocket by cpuguy83 on Monday December 01, 2014 @03:36PM (#8683607)
Docker can import any tarball as a rootfs for a container, essentially allowing you to use whatever build tool you want.

Dockerfiles/`docker build` is an implementation of a build system which uses the docker engine to make said rootfs.

Re:CoreOS is building a container runtime, Rocket by ash on Monday December 01, 2014 @05:47PM (#8684497)
Yes, but the actual container image that is being distributed can only be created by Docker. The ability to import is nice, but irrelevant here.