Currently image.flavor the README.md shows a default of apache, but no description outside of "image type".
In the image block in values.yaml it explains that if image.tag is unset, it uses image.flavor + .Chart.AppVersion to create image.tag, but doesn't give other options for image.flavor outside of the default apache.
Looking at the nextcloud docker README.md under supported tags, it lists fpm there, so is the only other valid option fpm?
I can submit a pull request if you want to clear up the documentation for newcomers in both files only this is cleared up :)