Box86, the x86 emulator, running in a docker.
Built to run x86 apps in docker containers on ARM devices. My primary use case was running a teamspeak3-server on a Raspberry Pi 4 or an RK-3328/3399 board.
FROM anujdatar/box86
# install/copy your x86 program here
CMD ["/box86/build/box86", "path-to-x86-executable"]
Uses debian:bullseye-slim as the base image. You can also use python:slim-bullseye as the base for the runner image if your target application needs python. You'd just have to build the image. Or install python3 on top of this image.