feat: support SSH public key content for CI

Use admin_ssh_public_key content when provided, otherwise
fall back to reading from admin_ssh_public_key_path file.

terraform/prod/02-cloud-init.tf

@@ -1,5 +1,10 @@
 # Fichier: terraform/prod/02-cloud-init.tf
 
+locals {
+  # Utilise le contenu direct si fourni (CI), sinon lit depuis le fichier (local)
+  ssh_public_key = var.admin_ssh_public_key != "" ? var.admin_ssh_public_key : file(var.admin_ssh_public_key_path)
+}
+
 resource "proxmox_virtual_environment_file" "cloud_config" {
   for_each = var.virtual_machines
 
@@ -11,7 +16,7 @@ resource "proxmox_virtual_environment_file" "cloud_config" {
     data = templatefile("${path.module}/../../cloud-init/user-data.yml.tftpl", {
       # Variables pour définir les informations de l'utilisateur
       username = lookup(each.value, "username", var.default_vm_user)
-      ssh_key  = file(var.admin_ssh_public_key_path)
+      ssh_key  = local.ssh_public_key
 
       # Variables pour définir les informations de la VM
       hostname = "${each.key}.${var.domain_suffix}"