Gpg Setup

# install
brew install gpg2

# generate RSA 4096
gpg --full-generate-key # RSA 4096

# setup gpg program
git config --global gpg.program $(which gpg)

# setup gpg key from list
gpg --list-secret-keys --keyid-format=long
git config --global user.signingkey <your GPG key> 

# setup gpg sign when commit
git config --global commit.gpgsign true