infra: introduce terraform/opentofu for proxmox management

- move ansible project within infra
- introduce terraform/opentofu for proxmox VM management

infra/terraform/proxmox/main.tf

@@ -0,0 +1,95 @@
+terraform {
+    required_providers {
+        proxmox = {
+            source  = "bpg/proxmox"
+            version = "0.78.2"
+        }
+    }
+}
+
+provider "proxmox" {
+  endpoint  = var.pm_api_url
+  api_token = var.pm_api_token
+  insecure = var.pm_insecure
+
+  ssh {
+    agent = false
+    username = var.pm_user
+    private_key = file(var.pm_ssh_private_key_path)
+  }
+}
+
+data "local_file" "ssh_public_key" {
+  filename = var.pm_ssh_public_key_path
+}
+
+resource "proxmox_virtual_environment_vm" "ubuntu_vm" {
+  for_each = { for vm in var.vms : vm.name => vm }
+
+  name      = each.value.name
+  node_name = each.value.node_name
+  vm_id     = each.value.vm_id
+
+  stop_on_destroy = true
+  keyboard_layout = "fi"
+
+  initialization {
+    ip_config {
+      ipv4 {
+        address = each.value.ip_address
+        gateway = each.value.gateway
+      }
+    }
+
+    dns {
+      servers = each.value.dns_servers
+    }
+
+    datastore_id = "local"
+
+    user_account {
+      username = var.vm_user_name
+      password = var.vm_user_password
+      keys     = [trimspace(data.local_file.ssh_public_key.content)]
+    }
+  }
+
+  cpu {
+    cores   = each.value.cores
+    sockets = 1
+  }
+
+  memory {
+    dedicated = each.value.memory
+  }
+
+  disk {
+    datastore_id = "local"
+    file_id      = proxmox_virtual_environment_download_file.ubuntu_cloud_image[each.value.node_name].id
+    interface    = "virtio0"
+    iothread     = true
+    discard      = "on"
+    size         = each.value.disk_size
+  }
+
+  network_device {
+    bridge = "vmbr0"
+  }
+  depends_on = [proxmox_virtual_environment_download_file.ubuntu_cloud_image]
+}
+
+resource "proxmox_virtual_environment_download_file" "ubuntu_cloud_image" {
+  for_each = toset(var.nodes)
+  content_type = "iso"
+  datastore_id = "local"
+  node_name    = each.key
+
+  url = "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
+}
+
+data "proxmox_virtual_environment_hosts" "hosts" {
+  for_each = toset(var.nodes)
+  node_name = each.key
+
+  depends_on = [proxmox_virtual_environment_vm.ubuntu_vm]
+}