Heroku deployment

deploy_heroku.sh

#!/bin/sh 
# This codeship custom script depends on: 
# - API_KEY env var from Heroku 
# - STAGING_APP_NAME 
# - STAGING_APP_URL 
set -e 

export HEROKU_API_KEY="${API_KEY}" 

# Turn on Heroku maintenance mode 
heroku maintenance:on --app ${STAGING_APP_NAME} 

# Push 
git remote add heroku "git@heroku.com:${STAGING_APP_NAME}.git" 
git push heroku -f "${COMMIT_ID}:refs/heads/master" 

# if migrations are enabled 
heroku_run rake db:migrate "${STAGING_APP_NAME}" 
# heroku_run restart "${STAGING_APP_NAME}" 

# Turn off Heroku maintenance mode 
heroku maintenance:off --app ${STAGING_APP_NAME} 

# check if the app is up and running 
check_url "${STAGING_APP_URL}"

Thank you very much @mlocher! I'll update the script.