[m]Flake sops & format

modules/nixos/system/security/sops/default.nix

@@ -1,6 +1,8 @@
-{ config, pkgs, ... }: {
+{ config, pkgs, ... }:
+let keyFilePath = "/var/lib/sops-nix/age-key.txt";
+in {
   sops.defaultSopsFile = ./common.yaml;
-  sops.age.keyFile = "/var/lib/sops-nix/age-key.txt";
+  sops.age.keyFile = keyFilePath;
   sops.age.generateKey = true;
 
   sops.secrets.wifi = { };
@@ -19,5 +21,6 @@
   sops.secrets."${config.hostcfg.hostname}_wg_pub" = { };
 
   environment.systemPackages = with pkgs; [ sops ];
+  environment.sessionVariables.OPS_AGE_KEY_FILE = keyFilePath;
 
 }