Commands to import and setup your gpg key for git commit signing

gpg-git-setup.sh

# install gpg
brew install gnupg

# copy my-gpg-key.asc from other workstation or lastpass or somewhere
# and then import it
gpg --import ~/Downloads/my-gpg-key.asc

# make sure it's there and get the key id (the part that comes after "rsa4096/")
gpg --list-secret-keys --keyid-format LONG

gpg --edit-key <key ID>

# then use the "trust" command to give your key ultimate trust - CTRL-D to exit gpg

# now tell git to use your key
git config --global user.signingkey <key ID>
git config --global commit.gpgsign true
git config --global push.gpgsign if-asked
git config --global gpg.program $(which gpg)

you also need to add the following to your .bash_profile

# be sure to add these 2 lines to your bash profile otherwise gpg git
# commit signing will say "failed to sign the data"
GPG_TTY=$(tty)
export GPG_TTY

If you are not using bash try adding the above lines to your ~/.zshrc then run source ~/.zshrc
I also feel that VPN and TMP Auth are required?
Also, the following block saved me multiple times:
if [ -r ~/.bash_profile ]; then echo 'export GPG_TTY=$(tty)' >> ~/.bash_profile; \ else echo 'export GPG_TTY=$(tty)' >> ~/.profile; fi

To export the GPG public key use the following command:

gpg --armor --export <key ID>