Revert "pruflas: remove hydra"

This reverts commit 65d06f563f.

nixos/pruflas/configuration.nix

@@ -9,6 +9,36 @@ in {
 
   services.logind.lidSwitch = "ignore";
 
+  services.hydra = {
+    enable = true;
+    package = pkgs.hydra-unstable;
+    hydraURL = "https://hydra.dadada.li";
+    notificationSender = "hydra@localhost";
+    buildMachinesFiles = [ ];
+    useSubstitutes = true;
+    listenHost = "hydra.dadada.li";
+    port = 3000;
+  };
+
+  nix.buildMachines = [
+    {
+      hostName = "localhost";
+      system = "x86_64-linux";
+      supportedFeatures = [ "kvm" "nixos-test" "big-parallel" "benchmark" ];
+      maxJobs = 8;
+    }
+  ];
+
+  services.nginx = {
+    recommendedTlsSettings = true;
+    recommendedOptimisation = true;
+    recommendedGzipSettings = true;
+    logError = "/dev/null";
+    appendHttpConfig = ''
+      access_log off;
+    '';
+  };
+
   dadada.admin.enable = true;
 
   dadada.backupClient = {
@@ -34,6 +64,8 @@ in {
     ];
   };
 
+  boot.kernelModules = [ "kvm-intel" ];
+
   # Use the systemd-boot EFI boot loader.
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;