Using this as base repo you can easily deploy sentry on heroku
Just click on the deploy button to create a new app with preinstalled sentry and the required redis/postrgesql/sendgrid addons (free)
Be sure to set an app name and change the environemnt variable accordignly. In case you didn't do that, use this command to set the sentry base url:
heroku config:set SENTRY_URL_PREFIX=https://YOURAPPNAME.herokuapp.com --app YOURAPPNAME
and, using heroku run you've to create a new superuser:
heroku run "sentry --config=sentry.conf.py createuser" --app YOURAPPNAME