configure git and github to sign commits

signing-commits.sh

#! /bin/bash

set -euo pipefail

# Interactively generate a new GPG key
gpg --default-new-key-algo rsa4096 --gen-key

# Get key id
KEY=$(gpg --list-secret-keys --keyid-format=long \
    | grep '^sec.*$' \
    | tr -s ' ' \
    | cut -d ' ' -f 2 \
    | cut -d '/' -f 2)

# Configure git client
git config --global user.signingkey $KEY
git config --global commit.gpgsign true

echo "Your public key (to give to github) :"
echo ""
gpg --armor --export $KEY