link URLs remain app.diagram.net when running on localhost:8080 #43

Spawning up drawio using docker-compose running locally on http://localhost:8080 works great.

However when 'File > Export as > URL' then the URL will start as https://app.diagram.net/?lightbox... .
Expectation is that the URL starts as http://localhost:8080/?lightbox... .

When changing the URL manually to localhost:8080 the diagram shows perfectly fine.

Considering the goal of providing the highest data privacy and security for customers who want to keep their data within their infrastructure, could this be fixed?