infra/: "infra" is YAMLs which should be deployed ahead of "service" YAMLs. It includes CertManager, Storage Class, etc.service/: "service" is actual YAMLs for UPnL services.
See upnl/infra for Terraform codes of UPnL infrastructure.
You should replace *.secret.yml.example with your own secrets to use this YAMLs properly. And you should setup docker image registries (ex: /etc/rancher/k3s/registries.yaml) to use GHCR docker images properly.