FROM $DOCKER_REPO:lts-15.5
ARG STACK_VERSION=2.3.1
RUN wget -qO- https://github.com/commercialhaskell/stack/releases/download/v$STACK_VERSION/stack-$STACK_VERSION-linux-x86_64.tar.gz | tar xz --wildcards --strip-components=1 -C /usr/local/bin '*/stack'