Starts the Canon printer service (ccpd) on demand when a printer (any printer) is attached.

Prerequisite: install the Canon printer driver packages from Canon's website as instructed.

Put the ccpd2.service file into `/etc/systemd/system` and run `systemctl daemon-reload && systemctl enable ccpd2` as root.

The file is called `cppd2.service` because systemd maps the `/etc/init.d/ccpd` script that comes with the printer driver package to the name `cppd`. Any name other than `cppd.service` would do just as fine.