What is the current behavior?

What is the expected or desired behavior?
Hello. I have install 9.0.0-rc3
composer create-project roots/sage sage dev-master
but there is no index.php or styles css in root. When I mount theme dir into /themes/ in WP, wp writes there is no style.css. What is current workflow to make sage theme installable ?
Please describe your local environment:
WordPress version: 4.7.5
OS: OSX
docker-compose file:
version: '2'
services:
wordpress:
image: wordpress
ports:
- 80:80
environment:
WORDPRESS_DB_PASSWORD: example
volumes:
- ./sage:/var/www/html/wp-content/themes/sage
mysql:
image: mariadb
environment:
MYSQL_ROOT_PASSWORD: example
If I try to user resources dir as root dir in theme
version: '2'
services:
wordpress:
image: wordpress
ports:
- 80:80
environment:
WORDPRESS_DB_PASSWORD: example
volumes:
- ./sushinroll/resources:/var/www/html/wp-content/themes/sushinroll
mysql:
image: mariadb
environment:
MYSQL_ROOT_PASSWORD: example
i've got an error

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