A lot of services are today deployed with containers on multiple machines. When looking at various containers like tools and databases, they all provide an option to set username/password up front via environment variables to make deployments easier.

Examples: PHPAdmin, MongoExpress, MySQL, MongoDB

It would be great to have 2 environment variables to set username and password for the GUI, so it can be easily deployed via container with ports open and security already up in place.

Syncthing already support STGUIAPIKEY to set the API key via env var, which can be used with container deployments. It would be great to expand that to user/pass to easily enable usage of the GUI in a secured way.