…abase config through .env + docker-compose (maria + pg)

…d Makefile helper accordingly

…g production config no matter the way we deploy.

…ript

…a new initial migration script for later branching/refactoring

…age rebuild. Add migration recipes and clarify the full docker run vs the local python venv relying on a "dockerized infra"

…in Docker files (faster, might be needed only for database init -> redecouple init from launcher ?)

…abse schema migration, failsafes crash on requirements files to commit to leave modified files, ignore the temporary .backup files, better doc, etc.