Keep data in `docker compose down` in dev setup?

Default docker-compose setup on main repo is designed for development, so there are no volumes for any services that would preserve the data when containers are downed.

misago-docker defines volumes and keeps data when containers are downed, but its designed for production deployments and would need modifications to work on localhost.

Ps. docker-compose is old and deprecated way to use compose in Docker. New way is going docker compose down because compose is now docker plugin and not a separate executable.

In postgres service find:

    ports:
      - '127.0.0.1:5432:5432'

Replace with:

    ports:
      - '127.0.0.1:5432:5432'
    volumes:
      - misago-postgres-15:/var/lib/postgresql/data

At end of docker-compose.yml add:

volumes:
  misago-postgres-15: