I will hold off doing a PR on the repository update until the the 2.0.0 series is ready. I have an alpha image out on Docker Hub (pluggemi/roon-web-controller) which I will be keeping current with development.
The Dockerfile that I wrote to build the container is a 2 stage Dockerfile - one to webpack/compile the web application, the second to take that compiled web application and publish it. This is to keep the published container as small as possible - stage one has a LOT of dev dependencies that are not required at runtime.
I am not sure how well Docker manifest will handle a two stage Dockerfile, but I also have very little experience with Docker manifest since it is a relatively new feature. So if you have any pointers on that, it would be appreciated!