combine chmod to prevent permission denied issues when chmod does not run

app/site_files.rb

@@ -58,8 +58,7 @@ post '/site_files/create' do
     end
   else
     file_path = current_site.files_path(name)
-    FileUtils.touch file_path
-    File.chmod 0640, file_path
+    File.open(file_path, 'a', 0640) {}
 
     site_file ||= SiteFile.new site_id: current_site.id, path: name
 

models/site.rb

@@ -1973,8 +1973,7 @@ class Site < Sequel::Model
       end
     end
 
-    FileUtils.cp uploaded.path, path
-    File.chmod 0640, path
+    FileUtils.install uploaded.path, path, mode: 0640
 
     SiteChange.record self, relative_path if !opts[:new_install] && File.extname(relative_path).match(HTML_REGEX)