Pushing to another machine? Yes. By strict definition. Steam exists to sell pre-compiled proprietary programs for dollars.

Rebuilding? No. Linux package management is so-so at allowing you to compile programs. But they’re dogshit garbage at helping you reliably run that program. Docker exists because Linux can’t run software.

Docker (and also Nix) exists because it's not trivial to manage the whole environment needed to run an application.

There's a reason everyone uses it for ops these days, and not some Windows thing.