chore: replace procodile with foreman for dev

Procfile.dev

@@ -0,0 +1,5 @@
+web: bundle exec puma -C config/puma.rb
+worker: bundle exec ruby script/worker.rb
+cron: bundle exec rake postal:cron
+smtp: bundle exec rake postal:smtp_server
+requeuer: bundle exec rake postal:requeuer