Added impermenence module and set Incarceron to be imperm so we can test

this

hosts/common/core/default.nix

@@ -18,6 +18,7 @@ in {
   imports = lib.flatten [
     inputs.home-manager.${platformModules}.home-manager
     inputs.sops-nix.${platformModules}.sops
+    inputs.impermanence.${platformModules}.impermanence
 
     (map lib.custom.relativeToRoot [
       "hosts/common/core/${platform}.nix"

hosts/common/core/impermanence.nix

@@ -0,0 +1,50 @@
+{
+  lib,
+  config,
+  ...
+}:
+lib.mkIf config.hostSpec.isImpermanent {
+  environment.persistence.${config.hostSpec.persistFolder} = {
+    enable = true;
+    directories = [
+      "/var/log"
+      "/var/lib/bluetooth"
+      "/var/lib/nixos"
+      "/var/lib/systemd/coredump"
+      "/etc/NetworkManager/system-connections"
+    ];
+    files = [
+      "/etc/machine-id"
+    ];
+    users.${config.hostSpec.username} = {
+      directories = [
+        "Downloads"
+        "Music"
+        "Pictures"
+        "Documents"
+        "Videos"
+        "VirtualBox VMs"
+        {
+          directory = ".gnupg";
+          mode = "0700";
+        }
+        {
+          directory = ".ssh";
+          mode = "0700";
+        }
+        {
+          directory = ".nixops";
+          mode = "0700";
+        }
+        {
+          directory = ".local/share/keyrings";
+          mode = "0700";
+        }
+        ".local/share/direnv"
+      ];
+      files = [
+        ".screenrc"
+      ];
+    };
+  };
+}