There is no build script, I did everything manually as described in this post.
Unfortunately, the corruption of the DTB file is something beyond my control. I recently discovered that the file was being overwritten by the u-Boot. I hope Starfive will address this issue in future releases of their Debian image.
I am currently waiting for the delivery of the revision B board so that I can test my image on both revisions. Until then, I do not plan on releasing any new images.