add zigfmt none-ls formating

lua/lazyvim/plugins/extras/lang/zig.lua

@@ -88,4 +88,14 @@ return {
       }
     end,
   },
+  {
+    "nvimtools/none-ls.nvim",
+    optional = true,
+    opts = function(_, opts)
+      local nls = require("null-ls")
+      opts.sources = vim.list_extend(opts.sources or {}, {
+        nls.builtins.formatting.zigfmt,
+      })
+    end,
+  },
 }