Move the database url config from the database.yml to the environment.yml

[drujensen]

Description

Currently both Granite and Crecto are using the config/database.yml file to configure the database. They also both support DATABASE_URL environment variable override.

This request is to add an initializer for Granite and Crecto that will look for a database_url in the environment instead.

This will provide the ability to specify different databases for development, test and production. It should continue to honor the DATABASE_URL override environment variable.

[elorest]

I'd like to pair with you on this.

[eliasjpr]

Can we start work on this? This seems to be fairly straightforward

[elorest]

Complete!