Add simple health check

app/controllers/health_controller.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class HealthController < ApplicationController
+  def index
+    errors = []
+    errors << 'database not conneected' unless database_connected?
+    status = errors.empty? ? :ok : :internal_server_error
+    render json: { errors: }, status:
+  end
+
+  private
+
+  def database_connected?
+    ApplicationRecord.connection.select_value('SELECT 1') == 1
+  rescue StandardError
+    false
+  end
+end

chart/templates/deployment.yaml

@@ -34,13 +34,9 @@ spec:
                 secretKeyRef:
                   name: rails-master-key
                   key: master.key
-          livenessProbe:
-            httpGet:
-              path: /
-              port: http
           readinessProbe:
             httpGet:
-              path: /
+              path: /healthz
               port: http
           resources:
             {{- toYaml .Values.resources | nindent 12 }}

config/routes.rb

@@ -17,4 +17,6 @@ Rails.application.routes.draw do
   end
   resources :match_scores, only: %i[show update]
   resources :groups, only: %i[show]
+
+  get 'healthz', to: 'health#index'
 end