This is Leiningen as an Alpine Linux package.
See the releases page for the latest download links.
The current installation method for this package is to install it with apk:
wget -P /etc/apk/keys/ https://alpine-pkgs.sgerrand.com/sgerrand.rsa.pub
apk add --no-cache --repository=https://apkproxy.herokuapp.com/sgerrand/alpine-pkg-leiningen leiningen=2.9.8-r0