It should be possible to support multiboot images (multiple operating systems in one image) by running the regular build process on each template in parallel and then merging the results into a final image.
The trick will be how to create a new EFI partition based on the originals. Merging those partitions might be complicated, so it may be best to just preserve them and chainload from GRUB.
It should be possible to support multiboot images (multiple operating systems in one image) by running the regular build process on each template in parallel and then merging the results into a final image.
The trick will be how to create a new EFI partition based on the originals. Merging those partitions might be complicated, so it may be best to just preserve them and chainload from GRUB.