Do you know what your Proxmox server is actually running?
Why settle for basic time-based triggers? Systemd timers offer better logging, dependency management, and you can run scripts "1 minute after boot." ...
To edit the build parameters, modify the ./src/args.sh file. That's it. The built file will be an ISO file in the ./src/dist directory. Simply mount the built ISO file to an virtual machine, and you ...