lint.lua: Use ruff for python

Author: vpv-csc

lua/kickstart/plugins/lint.lua

@@ -5,9 +5,9 @@ return {
     event = { 'BufReadPre', 'BufNewFile' },
     config = function()
       local lint = require 'lint'
-      lint.linters_by_ft = {
-        markdown = { 'markdownlint' },
-      }
+      lint.linters_by_ft = lint.linters_by_ft or {}
+      lint.linters_by_ft['markdown'] = { 'markdownlint' }
+      lint.linters_by_ft['python'] = { 'ruff' }
 
       -- To allow other plugins to add linters to require('lint').linters_by_ft,
       -- instead set linters_by_ft like this: