docker build -t brat .
Create a dir for authenticated users:
mkdir secrets
Create a file 'secrets/users.json' containing username/password pairs as follows:
{
"User1": "secret1",
"User2": "secret2"
}
docker run -p 8001:8001 -v "$(pwd)/secrets:/secrets" brat
Point browser to localhost:8001 and login using credentials from users.json