delegate pin management to tack

nix/default.nix

@@ -5,6 +5,7 @@
   nushell,
   makeBinaryWrapper,
   version,
+  tack,
   differ ? pkgs.dix,
   monitor ? pkgs.nix-output-monitor,
   ...
@@ -26,7 +27,8 @@ stdenvNoCC.mkDerivation {
     makeBinaryWrapper ${nushell}/bin/nu $out/bin/meat \
       --add-flags "$out/share/meat/meat.nu" \
       --set DIFFER ${lib.getExe differ} \
-      --set MONITOR ${lib.getExe monitor}
+      --set MONITOR ${lib.getExe monitor} \
+      --set TACK ${lib.getExe tack}
     runHook postInstall
   '';
 }

nix/module.nix

@@ -29,6 +29,10 @@ in
       description = "nix monitoring tool to use";
       default = pkgs.nix-output-monitor;
     };
+    tack = mkOption {
+      type = types.package;
+      description = "tack pin manager";
+    };
   };
   config = lib.mkIf cfg.enable {
     environment.sessionVariables.MEATS = cfg.flake;