MariaDB support #39
Description
I got feedback that support for MariaDB would be nice to have, I'm a little PostgreSQL biased, but MariaDB is awesome too.
- Replace postgresql dialect UUID field to backend agnostic UUID sqlalchemy field #38 first
- new option choice in cookiecutter for db
- some jinja
ifs in docker-compose files and for sqlalchemy engine code - maybe some other things will show up, not sure db session changes or if alembic configuration would survive it