ADD gitea databse config

app/libs/gitea/database.rb

@@ -0,0 +1,12 @@
+module Gitea
+  class Database < ActiveRecord::Base
+    self.abstract_class = true
+
+    def self.set_connection
+      gitea_server_config = Rails.configuration.database_configuration[Rails.env]["gitea_server"]
+      raise 'gitea database config missing' if gitea_server_config.blank?
+
+      establish_connection gitea_server_config
+    end
+  end
+end