... and I'm slooowly very slowly thinking of creating a "mock Docker".

Think 80% of Dockerfile syntax supported for running "docker build" against macOS guests. I do have some pieces already done here and there and basically it all comes down to actually creating a product out of a pile of various working scripts (OSS obviously). That's the hardest part.

And then comes the final boss of the game: marketing. Not sure anyone needs this at all.