Add SystemD instance-able service file
Instead of loading the configuration from a fixed directory, it would be very useful to easily create SystemD instances.
SystemD allows this to be done via the @ specifier, as depicted here: https://www.freedesktop.org/software/systemd/man/latest/systemd.service.html
The easiest would be to simply use this specifier to supply a folder location from which to load the credentials and config files