proxmox: add VM automation with OpenTofu and Ansible

Add automated workflow for building and deploying NixOS VMs on Proxmox including template2 host configuration, Ansible playbook for image building/deployment, and OpenTofu configuration for VM provisioning with cloud-init.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

terraform/variables.tf

@@ -0,0 +1,22 @@
+variable "proxmox_api_url" {
+  description = "Proxmox API URL (e.g., https://proxmox.home.2rjus.net:8006/api2/json)"
+  type        = string
+}
+
+variable "proxmox_api_token_id" {
+  description = "Proxmox API Token ID (e.g., root@pam!terraform)"
+  type        = string
+  sensitive   = true
+}
+
+variable "proxmox_api_token_secret" {
+  description = "Proxmox API Token Secret"
+  type        = string
+  sensitive   = true
+}
+
+variable "proxmox_tls_insecure" {
+  description = "Skip TLS verification (set to true for self-signed certs)"
+  type        = bool
+  default     = true
+}