install command installs ggshield as a git pre-commit or pre-push hook, either for the current repository (locally) or for all repositories (globally).
ggshield install [OPTIONS]
--append: append to existing script
--mode [local|global]: hook installation mode [required]
--hook-type [pre-commit|pre-push]: type of hook to install. Default is
--force: force override
--help: display detailed help