Installs ggshield as a pre-commit or pre-push hook.
ggshield install [OPTIONS]
install command installs ggshield as a git pre-commit or pre-push hook, either
for the current repository (locally) or for all repositories (globally).
--mode [local|global]: Hook installation mode. [required]
--hook-type [pre-commit|pre-push]: Type of hook to install.
--force: Overwrite any existing hook script.
--append: Append to existing script.
This command supports all ggshield global options.