fix(test): dmsquash-live test without an iso

.github/workflows/integration.yml

@@ -55,6 +55,7 @@ jobs:
                         "13",
                         "14",
                         "15",
+                        "16",
                         "17",
                         "20",
                         "21",

test/TEST-16-DMSQUASH/create-root.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+trap 'poweroff -f' EXIT
+
+# don't let udev and this script step on eachother's toes
+for x in 64-lvm.rules 70-mdadm.rules 99-mount-rules; do
+    : > "/etc/udev/rules.d/$x"
+done
+rm -f -- /etc/lvm/lvm.conf
+udevadm control --reload
+set -e
+
+udevadm settle
+mkfs.ext4 -q -L dracut /dev/disk/by-id/ata-disk_root
+mkdir -p /root
+mount /dev/disk/by-id/ata-disk_root /root
+mkdir -p /root/run /root/testdir
+echo "Creating squashfs"
+mksquashfs /source /root/testdir/rootfs.img -quiet
+umount /root
+echo "dracut-root-block-created" | dd oflag=direct,dsync of=/dev/disk/by-id/ata-disk_marker
+poweroff -f