The docker on first run will download the same version as tagged of Rustic Waters II and install it. This can take a while as the Forge installer can take a bit to complete. You can watch the logs and ...
usage: micro-minecraft-launcher-1.2.dev5-linux-x86_64 [-h] [-c CONFIG] [-d GAME_DIR] [-l] [-u USER] [--auth-uuid AUTH_UUID] [--auth-access-token AUTH_ACCESS_TOKEN ...