ci: Test resulting test ISO (#26)

tests/iso/README.md

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+Place scripts that will test the ISO. The ISO file will be passed as the first argument

tests/iso/os-release.sh

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+#!/bin/bash
+
+iso=$1
+
+sudo apt-get update
+sudo apt-get install -y squashfs-tools
+
+sudo mkdir /mnt/{iso,install}
+
+# Mount ISO
+sudo mount -o loop $iso /mnt/iso
+
+# Mount squashfs
+sudo mount -t squashfs -o loop /mnt/iso/images/install.img /mnt/install
+
+FOUND_VERSION=$(cat /mnt/install/etc/os-release | grep VERSION_ID | cut -d= -f2)
+
+# Cleanup
+sudo umount /mnt/install
+sudo umount /mnt/iso
+
+if [[ ${FOUND_VERSION} != ${VERSION} ]]
+then
+    echo "Version mismatch"
+    echo "Expected: ${VERSION}"
+    echo "Found: ${FOUND_VERSION}"
+    exit 1
+else
+    echo "Correct version found"
+    exit 0
+fi