Docker images with Z88DK Building Docker images Building Docker image based on Ubuntu docker build -t gstolarz/z88dk -t gstolarz/z88dk:2.1 \ --build-arg Z88DK_VERSION=2.1 . Building Docker image based on Alpine docker build -t gstolarz/z88dk:alpine -t gstolarz/z88dk:2.1-alpine \ --build-arg Z88DK_VERSION=2.1 -f Dockerfile-alpine .