updating nix gc config

systems/common.nix

@@ -13,7 +13,19 @@
 
   # hardware
   hardware.enableRedistributableFirmware = true;
-  networking.networkmanager.enable = true;
+
+  # Network
+ networking = {
+    extraHosts = "";
+    networkmanager = {
+      enable = true;
+      plugins = with pkgs; [
+        networkmanager-openvpn
+        networkmanager-openconnect
+      ];
+    };
+    useDHCP = false; # Depreciated
+  };
 
   # Bootloader
   boot.loader.systemd-boot.enable = true;
@@ -23,8 +35,24 @@
   boot.kernelPackages = pkgs.linuxPackages_latest;
 
   # Nix
+  nix = {
+    # Automate garbage collection
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "--delete-older-than 7d";
+    };
+    package = pkgs.nixVersions.stable;
+    modules.registry.nixpkgs.flake = inputs.nixpkgs;
+    settings = {
+      auto-optimise-store = true;
+      trusted-users = [ "root" "jsutter" ];
+      experimental-features = [ "nix-command" "flakes" ];
+      keep-outputs = true;
+      keep-derivations = true;
+    };
+  };
   system.stateVersion = "23.05";
-  nix.settings.experimental-features = [ "nix-command" "flakes" ];
   nixpkgs.config.allowUnfree = true;
 
   # Location & internationalisation
@@ -89,4 +117,20 @@
     pinentryFlavor = "gnome3";
     enableSSHSupport = true;
   };
+
+  # Docker & VirtualBox.
+  virtualisation = {
+    docker = {
+      enable = true;
+      autoPrune = {
+        enable = true;
+        dates = "weekly";
+      };
+    };
+    virtualbox.host = {
+      enable = false;
+      enableExtensionPack = false;
+    };
+  };
+  users.extraGroups.vboxusers.members = [ "jsutter" ];
 }