Loading database credentials from environment instead of config file

[wouterdedroog]

Hi, I want to host a Ruby application using standalone_migrations in Docker but I haven't figured out a way to do this without passing a database.yml file to the container. Is it possible to set the database credentials using environment variables?

[gugulen0k]

I thinks it's a bit late, but may be this will help someone =)
To use environment variables in database configuration file you have to:

1. Install ruby gem for managing environment variables. For example: dotenv from here https://rubygems.org/gems/dotenv
2. Insert in Rakefile following line

 require 'dotenv/load'