Add configuration.nix

configuration.nix

@@ -0,0 +1,64 @@
+{ modulesPath, config, pkgs, ... }:
+
+{
+  imports = 
+    [ 
+      # Default path for lxc/lxd configuration
+      "${modulesPath}/virtualisation/lxc-container.nix"
+    ];
+  boot.isContainer = true;
+
+  systemd.suppressedSystemUnits = [
+    "dev-mqueue.mount"
+    "sys-kernel-debug.mount"
+    "sys-fs-fuse-connections.mount"
+  ];
+
+  # Essential packages
+  environment.systemPackages = with pkgs; [
+    openssh
+    binutils
+    man
+    git
+ ];
+
+  # Administrative sudo user
+  users.users.admin = {
+    isNormalUser = true;
+    extraGroups = [ "wheel" ]; # wheel group is sudo access
+    };
+
+  security.sudo.wheelNeedsPassword = true;
+
+  # Facilitates access via VS Code Remote Explorer
+  programs.nix-ld.enable = true;
+
+  # Enable password-based SSH login for admin user
+  services.openssh = {
+    enable = true;
+    settings = {
+      AllowUsers = ["admin"]; # everyone
+      PasswordAuthentication = true; # this is just a sandbox
+      PermitRootLogin = "yes";
+    };
+  };
+
+  networking = {
+    dhcpcd.enable = false;
+    useDHCP = false;
+    useHostResolvConf = false;
+  };
+
+  systemd.network = {
+    enable = true;
+    networks."50-eth0" = {
+      matchConfig.Name = "eth0";
+      networkConfig = {
+        DHCP = "ipv4";
+        IPv6AcceptRA = true;
+      };
+      linkConfig.RequiredForOnline = "routable";
+    };
+  };
+  system.stateVersion = "24.11"; # Did you read the comment?
+}