feat: Improve karo-compose Docker secrets usage

[hazzuk]

Prerequisites

• I have searched existing and closed feature requests

Proposal

Currently the Ansible task up.yml in the role karo-compose has a growing list of conditionals, found in it's environment variables for passing Docker secrets.

An alternative approach to creating these environment variables should be investigated.

Motivation

This would avoid the need to hard code Docker secrets for each stack.

Context

Docker secrets should still be passed through as environment variables.