fix: Stop the scan for vmlinux failing

Previously this would fail on x86 as we set -e. By setting the || true
this means the script will continue. The grubby step next will fail if
it failed to find the image.

Signed-off-by: Jack Thomson <jackabt@amazon.com>

Author: JackThomson2

resources/hiding_ci/build_and_install_kernel.sh

@@ -122,7 +122,9 @@ al2023_update_boot() {
   dracut --kver $KERNEL_VERSION -f -v
 
   # This varies from x86 and ARM so capture what was generated
-  VM_LINUX_LOCATION=$(ls /boot/vmlinu{x,z}-$KERNEL_VERSION 2>/dev/null | head -n1)
+  # We add the || true here due to the fact that we have pipefail enabled
+  # this causes a non 0 exit when ls cant find vmlinux or vmlinux
+  VM_LINUX_LOCATION=$(ls /boot/vmlinu{x,z}-$KERNEL_VERSION 2>/dev/null | head -n1 || true)
 
   echo "Updating GRUB..."
   grubby --grub2 --add-kernel $VM_LINUX_LOCATION \