globally set up
git config --global commit.gpgsign true
▲ Turn on gpg signing commits globally
> gpg --list-keys
/c/Users/doda/.gnupg/pubring.kbx
--------------------------------
pub rsa4096 2020-02-14 [SC] [expires: 2036-02-10]
A**************************************
uid [ unknown] Dohyun Jung <****@****.***>
uid [ unknown] Dohyun Jung <****@****.***>
uid [ unknown] Dohyun Jung <****@****.***>
sub rsa4096 2020-02-14 [E] [expires: 2036-02-10]
▲ Copy the "*****" value below the "pub" (this is your own)
git config --global user.signingkey *******
▲ Paste the copied value into "*******"