Proxmox VE Template creating script

Bash script downloading the image and creating a UEFI booted cloud-init ready Proxmox VM template from scratch.

Supports Ubuntu for now, by default uses a Noble image, and templates a q35 type VM using host cpu and booted with UEFI bios, Qemu guest agent installed and ssh public key added - either user provided one or generated.

Usage:

1. Customize vars file as required. Defaults are highly opinionated ;)
2. Unless you add your ssh public key it will be generated. Public key can either be added as a String in vars (i.e. shorter ed25519 key), or you can just drop it into work directory named authorizedKey.pub

Kudos to @andrewglass3 for his script as it showed me the overall flow of VM creation with Proxmox CLI.