Extremely simple HTTP server (written in C) that responds on port 8000 with a hello message. The docker container is built using the "multi-stage build process, with the second build stage being FROM scratch (a completely empty file system with no Linux distro). For details on how to do that, see the Dockerfile.
I think this will build on many hardware architectures. :-) I tested in on a Raspberry Pi 3B (arm32v7) and the image size ended up being 0.4MB (see below). That's pretty tiny considering that the extremely tiny alpine Linux distro base container with no workload inside at all is about 10 times larger than this:
-rw-r--r-- 1 pi pi 4098560 Apr 27 20:03 alpine.tar
-rw-r--r-- 1 pi pi 419840 Apr 28 14:39 web-hello-c.tar