Our default configuration sets the admin in config.json to match The Owner's secret. With this in place, you can use plugmatic to install plugins in your local wiki farm. As of this writing the plugins do not get installed in a persistent location in the container. The next reboot of the web service will reset the container to its original state without the plugins installed.
wiki-plugin-graph wiki-plugin-assets
Browser --> DNS Browser --> localhost --> Docker --> Proxy --> Farm Docker --> Proxy Docker --> Farm Docker --> Image Transporter Proxy --> Image Transporter
GRAPH POST https://image-transporter.localtest.me/graphviz
If the transport plugin above reports that the service is currently unavailable, you probably must reassure your browser about the self-signed certificate at https://image-transporter.localtest.me 
. If you visit that page in another tab and allow the browser to connect, when you come back to this tab, reload the page and you should find the image transporter now available.