Simple totp subrequest authentication

Setup

# build the container image
docker compose build

# Popoulate .env file with an random secret
# corresponding qr-code for your TOTP mobile app and a text file called secret.qr`
./new-secret.sh

# Adapt the sample configuration `vdi.example.com_location` and copy it to `vhost.d` of your [reverse-proxy](https://github.com/nginx-proxy/nginx-proxy)

Credits:

Based on newhouseb/nginxwebauthn

References:

NGINX: Authentication Based on Subrequest Result