Run codespell with bundle exec rake

* rubocop/rubocop#13743
* rubocop/rubocop#14203

Author: Earlopain

Rakefile

@@ -41,7 +41,7 @@ end
 desc 'Run RuboCop over itself'
 RuboCop::RakeTask.new(:internal_investigation)
 
-task default: %i[documentation_syntax_check spec prism_spec internal_investigation]
+task default: %i[codespell documentation_syntax_check spec prism_spec internal_investigation]
 
 desc 'Generate a new cop template'
 task :new_cop, [:cop] do |_task, args|

tasks/codespell.rake

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+desc 'Run codespell if available'
+task :codespell do |_task|
+  next if Gem.win_platform?
+  next if ENV['CI'] # CI has its own workflow for this
+
+  sh 'which codespell', verbose: false, out: File::NULL, err: File::NULL do |ok, _res|
+    if ok
+      sh 'git ls-files --empty-directory | xargs codespell'
+    else
+      puts 'Skipping `codespell` since it is not installed'
+    end
+  end
+end