fix(iso): install genisoimage for isoinfo in smoke test

test-image.sh now verifies the arm64 GRUB boot chain with isoinfo
(RockRidge listing); the smoke-test runners did not have isoinfo
installed, so the step failed with exit 127. Add genisoimage to the
QEMU/ISO tooling step for both architectures.

Author: JusterZhu

.github/workflows/iso.yml

@@ -211,10 +211,10 @@ jobs:
           sudo apt-get update
           if [[ "${{ matrix.arch }}" == "amd64" ]]; then
             sudo apt-get install -y --no-install-recommends \
-              qemu-system-x86 qemu-utils ovmf xorriso squashfs-tools
+              qemu-system-x86 qemu-utils ovmf xorriso squashfs-tools genisoimage
           else
             sudo apt-get install -y --no-install-recommends \
-              qemu-system-arm qemu-utils qemu-efi-aarch64 xorriso squashfs-tools
+              qemu-system-arm qemu-utils qemu-efi-aarch64 xorriso squashfs-tools genisoimage
           fi
 
       - name: Validate ISO image contents

eng/iso/test-image.sh

@@ -16,9 +16,9 @@ esac
 readonly SQUASHFS_PATH="${WORK_DIR}/filesystem.squashfs"
 readonly EXTRACTED_ROOT="${WORK_DIR}/root"
 
-for command in xorriso unsquashfs sha256sum file; do
+for command in xorriso unsquashfs sha256sum file isoinfo; do
     if ! command -v "${command}" >/dev/null 2>&1; then
-        echo "error: ${command} is required to inspect the ISO." >&2
+        echo "error: ${command} is required to inspect the ISO (apt-get install genisoimage)." >&2
         exit 1
     fi
 done