This is a barebones version of https://github.com/lierdakil/alpine-haskell-stack that just uses prebuilt GHC instead of building it.
makeYou can specify a particular version via
make TARGET_GHC_VERSION=8.8.4 build(at the time of writing, only a few versions have an alpine binary available)
If you plan to publish to docker hub, adjust DOCKER_USERNAME in config.mk