Proxmox’s built-in cloud-init support is fine for the basics: a user, an SSH key, an IP config. It falls apart the second you want your own user-data, vendor-data or a real network-config. The GUI and the ci* options only expose a handful of fields. The escape hatch is cicustom pointing at snippet files, and that means getting files onto the Proxmox host’s filesystem first. The usual alternative is building a nocloud ISO yourself with genisoimage or mkisofs. That means a system…

go-proxmox has had a CloudInit() helper since 2023. It builds a small nocloud ISO in Go, uploads it to Proxmox and mounts it on the VM as a CD-ROM. It’s always worked fine for Linux guests. It has never worked for Windows guests running cloudbase-init. The reason is a filesystem extension from 1995 called Joliet.