feat: add ergon password and set sops key environment variable

modules/secrets/sops.nix

@@ -73,6 +73,8 @@ in
                 age.keyFile = host.sopsAdminKeyPath;
               };
 
+              home.sessionVariables.SOPS_AGE_KEY_FILE = host.sopsAdminKeyPath;
+
               home.packages = [ pkgs.sops ];
             };
         }