Magic Wormhole protocol. There’s a lot of clients out there. Here’s some:
In theory, you could make a fake executable with the mkv file extension on a unix system, by making it a shell script with a bunch of garbage data at the end, marking it executable, and distributing it with a tarball. But the chances someone will do that is insanely low.
Also it has caveats:
I mean, it would work, but you would be better off power-wise, price-wise, and performance-wise, going with a used office PC such as Optiplex.