#4 - Walking Skeleton - Test Environment on Heroku

In this issue we will finish the walking skeleton topic by deploying the application on Heroku into our test environment. In particular, we will perform the following steps:

• create Procfile for Heroku to tell how to run the Jmix application
• use a Spring profile "heroku" to configure the Jmix app in case of Heroku deployment
• use the Heroku Spring boot environment variables for fetching the database connection for Jmix
• let the Jmix app run on Java 17
• see Heroku logs of the Jmix application
• see the running application