how to sign commit in hook model

[Zixuan Liu]

I want to use the cz to sign commit, I tried add -s after cz, but it cannot work.

in git:

git commit -m "fix: xxx" -s

in git-cz with husky:

#!/bin/sh
. "$(dirname "$0")/_/husky.sh"

exec < /dev/tty && cz -s --hook || true

[Chris Kay]

Related to #820.