title: How do I deploy my Deno application to heroku which uses a postgresql database?
body: <p>I have an application which I'd like to deploy to heroku. I have already created the application in heroku and added the deno buildpack. I have also set up the databse using psql and created the tables. Now the only problem is I don't know how to write or use the .env file so that the Deno application can access the correct database credentials.</p>