For PVC nodes, the Ansible Framework will handle Debian repositories for you. You do not need to do anything manually.
To install the CLI client on an arbitrary Debian(-based) system, you can use the following commands:
$ source /etc/os-release
$ sudo mkdir /etc/apt/keyrings
$ wget -O- https://repo.parallelvirtualcluster.org/repo.parallelvirtualcluster.org.gpg \
| sudo gpg --dearmor --yes --output /etc/apt/keyrings/pvc.gpg
$ echo "deb [signed-by=/etc/apt/keyrings/pvc.gpg] https://repo.parallelvirtualcluster.org/debian ${VERSION_CODENAME} pvc" \
| sudo tee /etc/apt/sources.list.d/pvc.list
$ sudo apt update && sudo apt install pvc-client-cli