Dump checksums to screen after generating checksums file

script/prep-release.sh

@@ -78,6 +78,7 @@ for ipxe_disk in `ls .`
 do
   sha256sum $ipxe_disk >> ../netboot.xyz-sha256-checksums.txt
 done
+cat ../netboot.xyz-sha256-checksums.txt
 mv ../netboot.xyz-sha256-checksums.txt .
 cd ../..