Replace Heroku-specific Rake tasks with db:prepare now that Demo is…

… upgraded to Rails 7.1 (#1120)

Procfile

@@ -1,2 +1,2 @@
-release: bin/rails heroku:release
+release: bin/rails db:prepare
 web: bin/rails server

app.json

@@ -29,6 +29,6 @@
     }
   ],
   "scripts": {
-    "postdeploy": "bin/rails heroku:postdeploy"
+    "postdeploy": "bin/rails db:prepare"
   }
 }

spec/test_app/Rakefile

@@ -5,24 +5,6 @@ require_relative 'config/application'
 
 Rails.application.load_tasks
 
-namespace :heroku do
-  desc 'Heroku release tasks (runs on every code push, before postdeploy task on review app creation)'
-  task release: :environment do
-    unless ActiveRecord::SchemaMigration.table_exists?
-      Rails.logger.info "Database not initialized, skipping release tasks..."
-      next
-    end
-
-    Rake::Task['db:migrate'].invoke
-  end
-
-  desc 'Heroku postdeploy tasks (runs only on review app creation, after release task)'
-  task postdeploy: :environment do
-    Rake::Task['db:schema:load'].invoke
-    Rake::Task['db:seed'].invoke
-  end
-end
-
 def remove_version_from_schema_rb
   puts "GoodJob: Sanitizing Rails version from schema.rb...\n"
   schema_rb = Rails.root.join("db/schema.rb").to_s