add pagy, improve checks#index

app/controllers/application_controller.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class ApplicationController < ActionController::Base
+  include Pagy::Backend
+
   before_action :initialize_navbar
 
   private

app/controllers/checks_controller.rb

@@ -3,7 +3,7 @@ class ChecksController < ApplicationController
 
   # GET /checks or /checks.json
   def index
-    @checks = Check.all
+    @pagy, @checks = pagy(Check.search(filter_params[:s]))
   end
 
   # GET /checks/1 or /checks/1.json
@@ -66,6 +66,10 @@ class ChecksController < ApplicationController
     end
   end
 
+  def filter_params
+    @filter_params ||= params.permit(filter: %i[s level])[:filter] || {}
+  end
+
   private
 
   # Use callbacks to share common setup or constraints between actions.