First make sure all the required parameters has been set in git config.
Use this command:
sudo bash -c 'echo -e "[user]\n\tname = abc\n\temail = firstname.lastname@example.org" > /home/user/.gitconfig'
Change email & name as per your need. Once, you have created above file, run easyengine default installation command
wget -qO ee rt.cx/ee && sudo bash ee to install it in a non-interactive way.
Refer other variable https://github.com/EasyEngine/easyengine/blob/master/.travis.yml to make script non interactive.