Adapt jeremiah

Remove libvirtd, because it was conflicting with vbox
Some reason it's only registering 16GB of RAM now, so we will reduce its
parallel limit in Gitlab CI
Re-arrange the elements in the file to be in alphabetical order

hosts/jeremiah/default.nix

@@ -21,36 +21,6 @@
     efi.canTouchEfiVariables = true;
   };
 
-  virtualisation.libvirtd = {
-    enable = true;
-    allowedBridges = [ "virbr0" ];
-    onBoot = "ignore"; # only restart VMs labeled 'autostart'
-  };
-
-  networking = {
-    hostName = "jeremiah"; # Define your hostname.
-    useDHCP = false;
-    defaultGateway = {
-      address = " 10.42.1.2";
-      interface = "enp68s0";
-    };
-    interfaces = {
-      enp68s0 = {
-        ipv4.addresses = [
-          {
-            address = "10.42.1.8";
-            prefixLength = 16;
-          }
-        ];
-      };
-    };
-    nameservers = [ "10.42.1.5" ];
-  };
-  greg = {
-    home = true;
-    tailscale.enable = true;
-    remote-builder.enable = true;
-  };
   environment.systemPackages = with pkgs; [
     curl
     gawk
@@ -72,13 +42,41 @@
     };
   };
 
+  greg = {
+    home = true;
+    tailscale.enable = true;
+    remote-builder.enable = true;
+  };
+
+  networking = {
+    hostName = "jeremiah"; # Define your hostname.
+    useDHCP = false;
+    defaultGateway = {
+      address = " 10.42.1.2";
+      interface = "enp68s0";
+    };
+    interfaces = {
+      enp68s0 = {
+        ipv4.addresses = [
+          {
+            address = "10.42.1.8";
+            prefixLength = 16;
+          }
+        ];
+      };
+    };
+    nameservers = [ "10.42.1.5" ];
+  };
+
   #####################################################################################
   #################### Virtualbox Runner ##############################################
   #####################################################################################
+  age.secrets.runner-reg.file = ../../secrets/gitlab/jeremiah-runner-reg.age;
+
   services = {
     gitlab-runner = {
       enable = true;
-      settings.concurrent = 7;
+      settings.concurrent = 3;
       services = {
         shell = {
           executor = "shell";
@@ -92,14 +90,6 @@
       };
     };
   };
-  age.secrets.runner-reg.file = ../../secrets/gitlab/jeremiah-runner-reg.age;
-  virtualisation.virtualbox.host = {
-    enable = true;
-    enableExtensionPack = true;
-    enableHardening = false;
-    headless = true;
-    enableWebService = true;
-  };
 
   systemd.services."gitlab-runner" = {
     after = [
@@ -111,16 +101,18 @@
       "network-online.target"
       "tailscaled.service"
     ];
-    preStart = builtins.concatStringsSep "\n" [
-      "${pkgs.kmod}/bin/modprobe vboxdrv"
-      "${pkgs.kmod}/bin/modprobe vboxnetadp"
-      "${pkgs.kmod}/bin/modprobe vboxnetflt"
-    ];
-    postStop = "${pkgs.kmod}/bin/rmmod vboxnetadp vboxnetflt vboxdrv";
     serviceConfig = {
       DevicePolicy = lib.mkForce "auto";
       User = "root";
       DynamicUser = lib.mkForce false;
     };
   };
+
+  virtualisation.virtualbox.host = {
+    enable = true;
+    enableExtensionPack = true;
+    enableHardening = false;
+    headless = true;
+    enableWebService = true;
+  };
 }