2.0.0 introduces a minor nextcloud update to 23.0.4 and moves the database service to a seperate override.yml file to support different database types (mariadb / postgres). This might break your installation. Please add the following snippet to your config .env to ensure the right db is used:

```
COMPOSE_FILE="compose.yml"
COMPOSE_FILE="$COMPOSE_FILE:compose.mariadb.yml"
```