build.yml now downloads large-files release assets and copies them
to their bios/ paths (matched via .gitignore) before regenerating
the database. This fixes Batocera showing 675/680 instead of 679/680
on the remote (PS3UPDAT.PUP, dsi_nand.bin, PSVUPDAT.PUP were missing).
Local: Batocera 679/680, all others 100%.