First, build the project by invoking mvn package. Then copy the result artifact target/cloud-flight-tray-X.jar to ~/.local/share/java/cloud_flight_tray/cloud-flight-tray.jar. After that copy the systemd template service from tools/template-cloud-flight-tray.service to ~/.config/systemd/user/cloud-flight-tray.service. Finally, reload the systemd services via systemctl --user daemon-reload and start the service via systemctl --user enable --now cloud-flight-tray

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This project was heavily inspired by kondinskis/hyperx-cloud-flight