Add host bekkalokk

`bekkalokk` is a new machine, meant to host web services and eventually
miscellaneous services.

hosts/bekkalokk/configuration.nix

@@ -0,0 +1,42 @@
+{ pkgs, values, ... }:
+{
+  imports = [
+    ./hardware-configuration.nix
+
+    ../../base.nix
+
+    # TODO: set up authentication for the following:
+    # ./services/website/website.nix
+    # ./services/website/nginx.nix
+    # ./services/website/gitea.nix
+    # ./services/website/mediawiki.nix
+  ];
+
+  sops.defaultSopsFile = ../../secrets/bekkalokk/bekkalokk.yaml;
+  sops.age.sshKeyPaths = [ "/etc/ssh/ssh_host_ed25519_key" ];
+  sops.age.keyFile = "/var/lib/sops-nix/key.txt";
+  sops.age.generateKey = true;
+
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  networking.hostName = "bekkalokk";
+
+  networking.interfaces.ens33 = {
+    useDHCP = false;
+
+    ipv4.addresses = [{
+      address = values.hosts.bekkalokk.ipv4;
+      prefixLength = 25;
+    }];
+
+    ipv6.addresses = [{
+      address = values.hosts.bekkalokk.ipv6;
+      prefixLength = 64;
+    }];
+  };
+
+  # Do not change, even during upgrades.
+  # See https://search.nixos.org/options?show=system.stateVersion
+  system.stateVersion = "22.11";
+}