Data Source fails to account for erb in database.yml

And the configuration couldn't be overwritten.

For example:

production:
  <<: *default
  database: Database_production
  host: <%= ENV['POSTGRES_PORT_5432_TCP_ADDR'] %>
  port: <%= ENV['POSTGRES_PORT_5432_TCP_PORT'] %>
  username: <%= ENV['POSTGRES_ENV_POSTGRES_USERNAME'] %>
  password: <%= ENV['POSTGRES_ENV_POSTGRES_PASSWORD'] %>

This is a typical set up of docker.