meanwhile I found an interesting github-fork,
https://github.com/SebastianAppDev/greenlight, introducing the static-pin-functionality in greenlight. I would like to give it a try, and from my understanding of docker, I would have to clone the repository, edit my original docker-compose.yml that provides the running original greenlight, mount the repository into the container and restart greenlight. Could you please give me a useful tipp, what exactly of the forked repository has to be mounted, because I don't know, which files where changed in comparison to the main repository?
Thanks again and best.