Krikri::VaultCli
VaultCli - krikri-playbook vault <subcommand> ..., matching real
ansible-vault's CLI shape for the common, non-interactive
subcommands. create/edit (which launch $EDITOR) aren't implemented.
Class methods
Public: also used directly by krikri-playbook.cr's --ask-vault-pass for
running a playbook (not just the vault subcommands here).