Ci/GitHub actions (#7822)

Merge pull request 7822

test/helper.rb

@@ -80,6 +80,17 @@ module DirectoryHelpers
   def test_dir(*subdirs)
     root_dir("test", *subdirs)
   end
+
+  def temp_dir(*subdirs)
+    if Utils::Platforms.windows?
+      drive = Dir.pwd.sub(%r!^([^\/]+).*!, '\1')
+      temp_root = File.join(drive, "tmp")
+    else
+      temp_root = "/tmp"
+    end
+
+    File.join(temp_root, *subdirs)
+  end
 end
 
 class JekyllUnitTest < Minitest::Test