rails up to 7.0and ruby to 2.7.2

mv lib to app/lib due to upgrade

removing concerns from autoload path

resolve zeitwerk issues

make foodsoft run for dev on rails 7 and ruby 2.7

fix mail file permission bug

fix database_config

fix articles controller test ActiveModell::Error

bump Gemfile.lock

app/lib/users_csv.rb

@@ -0,0 +1,39 @@
+class UsersCsv < RenderCsv
+  include ApplicationHelper
+
+  def header
+    row = [
+      User.human_attribute_name(:id),
+      User.human_attribute_name(:name),
+      User.human_attribute_name(:nick),
+      User.human_attribute_name(:first_name),
+      User.human_attribute_name(:last_name),
+      User.human_attribute_name(:email),
+      User.human_attribute_name(:phone),
+      User.human_attribute_name(:last_login),
+      User.human_attribute_name(:last_activity),
+      User.human_attribute_name(:iban),
+      User.human_attribute_name(:ordergroup)
+    ]
+    row + User.custom_fields.pluck(:label)
+  end
+
+  def data
+    @object.each do |o|
+      row = [
+        o.id,
+        o.name,
+        o.nick,
+        o.first_name,
+        o.last_name,
+        o.email,
+        o.phone,
+        o.last_login,
+        o.last_activity,
+        o.iban,
+        o.ordergroup&.name
+      ]
+      yield row + User.custom_fields.map { |f| o.settings.custom_fields[f[:name]] }
+    end
+  end
+end