mount tmpfs on /tmp and Downloads

gAluminum/configuration.nix

@@ -1,11 +1,11 @@
 { config, pkgs, ... }:
- 
+
 {
   imports = [ ./hardware-configuration.nix ];
 
   nixpkgs.config.allowUnfree = true;
   networking.hostName = "gAluminum";
-  
+
   time.timeZone = "Europe/London";
 
   i18n.defaultLocale = "en_US.UTF-8";
@@ -63,7 +63,7 @@
     neovim
     home-manager
   ];
-  
+
   fonts.fonts = with pkgs; [cascadia-code];
 
   system.stateVersion = "21.05"; # Did you read the comment?
@@ -97,5 +97,17 @@
       ];
     };
   };
+
+  fileSystems."/tmp" = {
+    device = "tmpfs";
+    fsType = "tmpfs";
+    options = ["size=2G"];
+  };
+
+  fileSystems."/home/giulio/Downloads" = {
+    device = "tmpfs";
+    fsType = "tmpfs";
+    options = ["size=3G"];
+  };
 }