Add support for AppUpdates

* Added model
* Added blueprint
* Added method to ApiController
* Added route

app/blueprints/api/v1/update_blueprint.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module Api
+  module V1
+    class UpdateBlueprint < Blueprinter::Base
+      fields :update_type, :updated_at
+    end
+  end
+end

app/controllers/api/v1/api_controller.rb

@@ -36,6 +36,11 @@ module Api
       respond_to :json
 
       ##### Methods
+      # Returns the latest update
+      def latest
+        render json: UpdateBlueprint.render_as_json(AppUpdate.last)
+      end
+
       # Assign the current user if the Doorkeeper token isn't nil, then
       # update the current user's last seen datetime and last IP address
       # before returning
@@ -85,9 +90,9 @@ module Api
 
       def render_not_found_response(object)
         render json: ErrorBlueprint.render(nil, error: {
-                                             message: "#{object.capitalize} could not be found",
-                                             code: 'not_found'
-                                           }), status: :not_found
+          message: "#{object.capitalize} could not be found",
+          code: 'not_found'
+        }), status: :not_found
       end
 
       def render_unauthorized_response

app/models/app_update.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class AppUpdate < ApplicationRecord
+
+end

config/routes.rb

@@ -13,6 +13,8 @@ Rails.application.routes.draw do
       resources :grid_summons, only: %i[update destroy]
       resources :favorites, only: [:create]
 
+      get 'latest', to: 'api#latest'
+
       get 'users/info/:id', to: 'users#info'
 
       get 'parties/favorites', to: 'parties#favorites'