Add a target for the hydra server.

nix/configuration/hosts/hydra/default.nix

@@ -0,0 +1,27 @@
+{ config, pkgs, ... }:
+{
+  imports = [
+    ./hardware-configuration.nix
+    ./disk-config.nix
+    ./optimized_build.nix
+  ];
+
+  # Generate with `head -c4 /dev/urandom | od -A none -t x4`
+  networking.hostId = "fbd233d8";
+
+  networking.hostName = "hydra"; # Define your hostname.
+
+  time.timeZone = "America/New_York";
+  i18n.defaultLocale = "en_US.UTF-8";
+
+  me.secureBoot.enable = false;
+
+  # Mount tmpfs at /tmp
+  boot.tmp.useTmpfs = true;
+
+  me.emacs_flavor = "plainmacs";
+  me.graphical = false;
+  me.zsh.enable = true;
+  me.wireguard.activated = [ ];
+  me.wireguard.deactivated = [ ];
+}