Modularize code

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

users/common/configs/sops/default.nix

@@ -0,0 +1,17 @@
+{ config, inputs, lib, ... }:
+
+let
+  sopsKeyPath = ".config/sops-nix/key.txt";
+in
+{
+  environment.sessionVariables.SOPS_AGE_KEY_FILE = "$HOME/${sopsKeyPath}";
+
+  home-manager = {
+    sharedModules = [{ imports = [ inputs.sops-nix.homeManagerModules.sops ]; }];
+
+    users = lib.attrsets.mapAttrs (user: config: ({
+      home.persistence."/persist${config.home}".files = [ sopsKeyPath ];
+      sops.age.keyFile = "/persist${config.home}/${sopsKeyPath}";
+    })) (lib.attrsets.filterAttrs (name: config: config.isNormalUser) config.users.users);
+  };
+}