droppie/impermanence: use module

hosts/default.nix

@@ -64,6 +64,7 @@
       droppie = self.nixos-flake.lib.mkLinuxSystem {
         nixpkgs.hostPlatform = "x86_64-linux";
         imports = [
+          inputs.impermanence.nixosModules.impermanence
           self.nixosModules.base
           ./droppie
           self.nixosModules.yule

hosts/stroopwafel/default.nix

@@ -4,6 +4,5 @@
     ./hardware-configuration.nix
 
     ./networking.nix
-    ./persistence.nix
   ];
 }

hosts/stroopwafel/persistence.nix

@@ -1,6 +0,0 @@
-{ lib, config, ... }:
-{
-  systemd.tmpfiles.rules = [
-    "L /etc/nixos - - - - /home/${config.pub-solar.user.name}/Workspace/os"
-  ];
-}