This provides a small but a fully functional MRI Ruby runtime environment. This image is based on my Tiny Core Linux Docker image.
2.4,latest(2.4/Dockerfile)2.4-onbuild(2.4/onbuild/Dockerfile)2.3(2.3/Dockerfile)2.3-onbuild(2.3/onbuild/Dockerfile)2.2(2.2/Dockerfile)2.2-onbuild(2.2/onbuild/Dockerfile)2.1(2.1/Dockerfile)2.1-onbuild(2.1/onbuild/Dockerfile)
This can be used in the same way as Official Ruby Image. Please see "How to use this image" section of it with replacing the image name with this one.
This doesn't contain a compiler, a linker and headers etc. so if you'd like to add a something C extension for Ruby, first you need to install them by tce-load command. Please refer this image's Dockerfile which is a good example of installing those packages.