The commit date provides an easy method to compare two shuttle_index.json files and detect which of the files relates to a newer commit. This enables us to prevent a situation where an earlier shuttle_index overrides a later one.
So we can generate the ROM while building the shuttle's GDS
The final GDS file name has changed in recent OpenLane2 and is now {module}.gds instead of {module}.magic.gds.
Uri Shaked