This repo uses and alpine linux based docker image to build a single binary static gnu sed 4.2.2.
You can download it from the release page
The oneliner install is:
curl -L https://github.com/sequenceiq/docker-gnused-linux-bin/releases/download/v4.2.2/sed-linux-4.2.2.tgz | tar -xz -C /usr/local/bin/
Different linux distributions use different package managers, so the way you install gnu sed varies.
We wanted to have a simple curl | tar -xz
type oneliner which works on all linux flavor.