do you want a helm chart for this? the "requirements" page scares me, although I suspect this whole thing could be launched with a docker-compose / helm deploy very easily.
I ignored the requirements page entirely, downloaded it as a zip file into my existing (PHP-based) web server, unzipped it, and it basically worked immediately.
I think this would be the case for anyone else running a relatively modern existing PHP setup, and for everyone else they can just use the Docker image.