This is a plugin for asdf to install/manage earthly
asdf plugin add earthly https://github.com/hpcsc/asdf-earthly.git
Check out asdf readme for general usage of asdf
Most common usage:
asdf list-all earthly # list all available versions of earthly
asdf install earthly [latest|x.y.z] # install latest|x.y.z version
asdf global earthly x.y.z # set version x.y.z as global