add missing shebangs to temp generated shell code files

Closes: #952863

scripts/build/binary_hdd

@@ -285,6 +285,7 @@ if [ "${LB_FIRST_BOOTLOADER}" = "grub" ]
 then
 
 cat > chroot/grub.sh << EOF
+#!/bin/sh
 cd binary.tmp
 grub --batch << EOM
 find /live/vmlinuz
@@ -298,6 +299,7 @@ EOF
 	echo "WAITING..." && read WAIT
 
 #cat > chroot/grub.sh << EOF
+#!/bin/sh
 #grub --batch << EOM
 #root $rootpartition
 #setup $hdddev

scripts/build/installer_debian-installer

@@ -678,6 +678,7 @@ then
 	esac
 
 cat > chroot/binary.sh << EOF
+#!/bin/sh
 cd /root/binary && apt-ftparchive \
 	-o APT::FTPArchive::Release::Origin="Debian" \
 	-o APT::FTPArchive::Release::Label="Debian" \

scripts/build/source_iso

@@ -105,6 +105,7 @@ XORRISO_OPTIONS="${XORRISO_OPTIONS} --modification-date=$(date --utc --date="@${
 mv source chroot
 
 cat > chroot/source.sh << EOF
+#!/bin/sh
 xorriso ${XORRISO_OPTIONS} -o source.iso source
 EOF