Merge pull request #5 from marianitadn/connect-app-to-database

Connect Ruby app to database.
Get database container IP from environment variables
Merge pull request #10 from marianitadn/update-database-ip

Get database container IP from environment variables
use cmd not entrypoint so it can be overridden.
print out db connection parameters
fix active record db host
Create and show database objects in when running the app