This is just a simple GitHub workflow that takes the link to your stock rom in .zip format, extract all the files then pushes them to the release page.
Yes it works, i have tested it personally with 4 different links. This does not garantee that it will definitely work for you especially if your device super.img is bigger than 2G when compressed, this is as a limitation from GitHub.
when you enter your rom direct download link in .zip format and other details it first off sets up an Ubuntu server, then downloads the rom and extracts the whole files into a single directory, it then compresses the super.img using xz compression method. This us because super.img files tends to be larger than 2G which will not upload there by making the whole process fail.
For now it can only process archive files in .zip format which kind of limits the usability of the tool to only people with .zip packaged ROM.
As a student i don't have enough time to make it completely compatible with other compression methods, but I will definitely appreciate it if someone wil be able to help with that.