fix: use absolute path for core-list.txt in install-cores.sh

Use BASH_SOURCE to get the script's directory, allowing the script to
run correctly from any working directory.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/install-cores.sh

@@ -6,6 +6,8 @@ outdir="${1:-./artifacts}"
 cores_dir="$(mktemp -d)"
 trap 'rm -rf "$cores_dir"' 0
 
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
 base_url="https://raw.githubusercontent.com/christianhaitian/retroarch-cores/master/aarch64"
 target_dir="$cores_dir/home/emulation/.config/retroarch/cores"
 mkdir -p "$target_dir"
@@ -20,7 +22,7 @@ while IFS= read -r core; do
     else
         echo "Warning: Failed to download $core, skipping"
     fi
-done < scripts/core-list.txt
+done < "$script_dir/core-list.txt"
 
 tar cf "$outdir/cores.tar" -C "$cores_dir" .
 echo "Cores tarball created at $outdir/cores.tar"