Creation of Git deployment key for user www-data on Debian

deployment_key.sh

# let's be root
su

# go the apache folder
cd /var/www

# create folder to store keys
mkdir .ssh
chown -R www-data:www-data .ssh
# create keys
sudo -u www-data ssh-keygen -t rsa

# add it to gh

# add known hosts
# https://stackoverflow.com/questions/40442476/github-authentication-failed-with-user-www-data
ssh-keyscan -t rsa github.com >> /var/www/.ssh/known_hosts

# update a repository
cd /data/git/some-repository
sudo -u www-data git pull