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>

hosts/template2/configuration.nix

@@ -0,0 +1,75 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [
+    ./hardware-configuration.nix
+    ../../system/sshd.nix
+  ];
+
+  # Root user with no password but SSH key access for bootstrapping
+  users.users.root = {
+    hashedPassword = "";
+    openssh.authorizedKeys.keys = [
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAwfb2jpKrBnCw28aevnH8HbE5YbcMXpdaVv2KmueDu6 torjus@gunter"
+    ];
+  };
+
+  # Proxmox image-specific configuration
+  # Configure storage to use local-zfs instead of local-lvm
+  image.modules.proxmox = {
+    proxmox.qemuConf.virtio0 = lib.mkForce "local-zfs:vm-9999-disk-0";
+    proxmox.qemuConf.boot = lib.mkForce "order=virtio0";
+    proxmox.cloudInit.defaultStorage = lib.mkForce "local-zfs";
+  };
+
+  # Configure cloud-init to only use NoCloud datasource (no EC2 metadata service)
+  services.cloud-init.settings = {
+    datasource_list = [ "NoCloud" ];
+    datasource = {
+      NoCloud = {
+        fs_label = "cidata";
+      };
+    };
+  };
+
+  boot.loader.grub.enable = true;
+  boot.loader.grub.device = "/dev/vda";
+  networking.hostName = "nixos-template2";
+  networking.domain = "home.2rjus.net";
+  networking.useNetworkd = true;
+  networking.useDHCP = false;
+  services.resolved.enable = true;
+
+  systemd.network.enable = true;
+  systemd.network.networks."ens18" = {
+    matchConfig.Name = "ens18";
+    networkConfig.DHCP = "ipv4";
+    linkConfig.RequiredForOnline = "routable";
+  };
+  time.timeZone = "Europe/Oslo";
+
+  nix.settings.experimental-features = [
+    "nix-command"
+    "flakes"
+  ];
+  nix.settings.tarball-ttl = 0;
+  environment.systemPackages = with pkgs; [
+    age
+    vim
+    wget
+    git
+  ];
+
+  # Open ports in the firewall.
+  # networking.firewall.allowedTCPPorts = [ ... ];
+  # networking.firewall.allowedUDPPorts = [ ... ];
+  # Or disable the firewall altogether.
+  networking.firewall.enable = false;
+
+  system.stateVersion = "25.11";
+}