hosts: *: remove tmpfs and add swap

hosts/server/hardware-configuration.nix

@@ -21,7 +21,8 @@
   boot.initrd.kernelModules = [ "vfio_pci" "vfio" "vfio_iommu_type1" ];
   boot.kernelModules = [ "kvm-amd" ];
   boot.extraModulePackages = [ ];
-  boot.tmp.useTmpfs = true;
+  boot.tmp.useTmpfs = false;
+  boot.tmp.cleanOnBoot = true;
   zramSwap.enable = true;
 
   services.btrfs.autoScrub = {
@@ -83,6 +84,12 @@
       options = [ "compress=zstd,space_cache=v2,ssd,noatime,subvol=@nix,discard=async" ];
     };
 
+  fileSystems."/swap" =
+    { device = "/dev/disk/by-label/NIXROOT";
+      fsType = "btrfs";
+      options = [ "compress=zstd,space_cache=v2,ssd,noatime,subvol=@swap,discard=async" ];
+    };
+
   fileSystems."/mnt/snapshots/root" =
     { device = "/dev/disk/by-label/NIXROOT";
       fsType = "btrfs";
@@ -90,7 +97,7 @@
     };
 
 
-  swapDevices = [ ];
+  swapDevices = [ { device = "/swap/swapfile"; } ];
   
   networking = {
     useDHCP = false;                        # Deprecated