Allow further customisation of db through env
Allow further customisation of db through env

Adds more variables to database.yml and logic to allow
different levels of  overrides and customisation as needed
for the new stack and docker-compose.

ministryofjustice/parliamentary-questions,ministryofjustice/parliamentary-questions,ministryofjustice/parliamentary-questions,ministryofjustice/parliamentary-questions,ministryofjustice/parliamentary-questions