config.sh: Add snippet to configure sudo for Vagrant images

The vagrant user used in Vagrant images needs the ability
to use sudo with no restrictions. This is fine and expected
for Vagrant images, as they are only intended to be used
for development purposes.

config.sh

@@ -147,6 +147,13 @@ EOKEYS
 chmod 600 ~vagrant/.ssh/authorized_keys
 chown -R vagrant:vagrant ~vagrant/.ssh/
 
+cat > /etc/sudoers.d/vagrant << EOSUDOER
+## Ensure the vagrant user always can use sudo
+Defaults:vagrant !requiretty
+vagrant ALL=(ALL) NOPASSWD: ALL
+EOSUDOER
+chmod 600 /etc/sudoers.d/vagrant
+
 cat > /etc/ssh/sshd_config.d/10-vagrant-insecure-rsa-key.conf <<EOF
 # For now the vagrant insecure key is an rsa key
 # https://github.com/hashicorp/vagrant/issues/11783