[enhancement] Support running Freyja application services as a systemd service

[ladatz]

Description

Support running Freyja application services as a systemd service. Today we have examples and instructions for running the service as a native process and a container (with either podman or Docker). Adding support for systemd involves creating systemd service files, configuring it, and testing.

Acceptance criteria

• Systemd service files for the projects contributed
• Documentation for running the service as a systemd service
• End to end tested with service running as systemd service