feat: hledger test

nixos/modules/services/hledger.nix

@@ -1,5 +1,6 @@
 {
   flake,
+  pkgs,
   ...
 }:
 let
@@ -40,6 +41,15 @@ in
     };
   };
 
+  environment = {
+    # enableAllTerminfo = true;
+    systemPackages = builtins.attrValues {
+      inherit (pkgs)
+        hledger
+        ;
+    };
+  };
+
   fileSystems."/var/lib/${service.name}" = {
     device = service.paths.path0;
     fsType = "none";