add env_file for local vars in docker-compose

    ports:

      - "3000:3000"

    environment:

      - SESSION_SECRET=CHANGE ME TO RANDOM VALUE

      - REDIS_HOST=redis://redis

      - DATABASE_URL=postgres://postgres@postgres/canvas

      - AUTH_ENDPOINT=https://auth.fediverse.events

      - AUTH_CLIENT=canvas

      - AUTH_SECRET=${AUTH_SECRET}

    env_file:

      - .env.local

    depends_on:

      redis:

        condition: service_healthy