Lazy Install

Let's change the tool version.

# Change cli/cli version to v2.1.0
$ sed -i "s|cli/cli@.*|cli/cli@v2.1.0|" aqua.yaml

$ gh version
INFO[0000] download and unarchive the package            aqua_version=1.19.2 package_name=cli/cli package_version=v2.1.0 program=aqua registry=standard
gh version 2.1.0 (2021-10-14)
https://github.com/cli/cli/releases/tag/v2.1.0

You find that cli/cli@v2.1.0 is installed automatically. You don't have to run aqua i explicitly. We call this feature as Lazy Install.

Note that Lazy Install doesn't work if the symbolic link isn't created in ${AQUA_ROOT_DIR}/bin yet.