Modularize code

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/persist/default.nix

@@ -0,0 +1,22 @@
+{ inputs, lib, ... }:
+
+{
+  imports = [ inputs.impermanence.nixosModules.impermanence ];
+
+  fileSystems."/persist".neededForBoot = true;
+  boot.initrd.postDeviceCommands = lib.mkAfter (builtins.readFile ./impermanence.sh);
+
+  environment.persistence."/persist" = {
+    hideMounts = true;
+    directories = [
+      "/etc/nixos"
+      "/etc/NetworkManager/system-connections"
+      "/var/lib/nixos"
+      "/var/lib/systemd/coredump"
+      "/var/log"
+    ];
+    files = [
+      "/etc/machine-id"
+    ];
+  };
+}