feat: set up 'eetion-02' raspberry pi host

hosts/eetion-02/default.nix

@@ -0,0 +1,86 @@
+{ pkgs, ... }:
+
+# Raspberry Pi 3
+# See <https://nixos.wiki/wiki/NixOS_on_ARM/Raspberry_Pi_3>
+
+let
+  username = "h";
+  hostName = "eetion-02";
+in
+{
+  imports = [
+    ./hard.nix
+    ../../modules/ssh/hardened-openssh.nix
+  ];
+
+  ssh = {
+    inherit username;
+    publicHostname = "eetion-02";
+    authorizedHosts = [
+      "andromache"
+      "astyanax"
+    ];
+  };
+
+  boot = {
+    kernelParams = [
+      "console=ttyS1,115200n8"
+    ];
+
+    kernel.sysctl."net.ipv4.ip_forward" = 1;
+
+    loader = {
+      grub.enable = false;
+      generic-extlinux-compatible.enable = true;
+    };
+  };
+
+  hardware.enableRedistributableFirmware = true;
+
+  networking = {
+    inherit hostName;
+    networkmanager.enable = true;
+    firewall = {
+      enable = true;
+      allowedTCPPorts = [
+        80
+        443
+      ];
+    };
+  };
+
+  users.users = {
+    root.hashedPassword = "!";
+    ${username} = {
+      isNormalUser = true;
+      extraGroups = [ "wheel" ];
+    };
+  };
+
+  security.sudo.wheelNeedsPassword = false;
+
+  services = {
+    openssh = {
+      enable = true;
+      harden = true;
+    };
+  };
+
+  environment.systemPackages = with pkgs; [
+    vim
+    git
+  ];
+
+  nix.settings = {
+    experimental-features = [
+      "nix-command"
+      "flakes"
+    ];
+    trusted-users = [
+      "root"
+      "@wheel"
+    ];
+  };
+
+  system.stateVersion = "26.05";
+}

hosts/eetion-02/hard.nix

@@ -0,0 +1,24 @@
+{ lib, modulesPath, ... }:
+
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  boot = {
+    initrd.availableKernelModules = [ ];
+    initrd.kernelModules = [ ];
+    kernelModules = [ ];
+    extraModulePackages = [ ];
+  };
+
+  fileSystems."/" = {
+    device = "/dev/disk/by-label/NIXOS_SD";
+    fsType = "ext4";
+    options = [ "noatime" ];
+  };
+
+  swapDevices = [ ];
+
+  nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";
+}

hosts/eetion-02/system.nix

@@ -0,0 +1 @@
+"aarch64-linux"