move sites to their own modules

modules/nixos/sites/mirror/default.nix

@@ -0,0 +1,44 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+with lib;
+with lib.custom; let
+  cfg = config.sites.mirror;
+in {
+  options.sites.mirror = with types; {
+    enable = mkBoolOpt false "Enable ArchLinux Mirror";
+  };
+
+  config = mkIf cfg.enable {
+    systemd.timers."mirror-update" = {
+      wantedBy = ["timers.target"];
+      timerConfig = {
+        OnBootSec = "1h";
+        OnUnitActiveSec = "1h";
+        Unit = "mirror-update.service";
+      };
+    };
+
+    systemd.services."mirror-update" = {
+      script = ''
+        ${pkgs.rsync}/bin/rsync -vPa rsync://mirrors.lug.mtu.edu/archlinux/ /var/www/mirror.zackmyers.io/archlinux/
+      '';
+      serviceConfig = {
+        Type = "oneshot";
+        User = "root";
+      };
+    };
+
+    services.nginx.virtualHosts."mirror.zackmyers.io" = {
+      forceSSL = true;
+      enableACME = true;
+      root = "/var/www/mirror.zackmyers.io";
+      locations."/".extraConfig = ''
+        autoindex on;
+      '';
+    };
+  };
+}