UBUNTU: [Debian] Make ubuntu-regression-suite skippable on unbootable kernels.

BugLink: https://bugs.launchpad.net/bugs/1823056Signed-off-by: Dimitri John Ledkov <xnox@ubuntu.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

debian/tests/control

@@ -4,4 +4,4 @@ Restrictions: allow-stderr
 
 Tests: ubuntu-regression-suite
 Depends: build-essential, gcc-multilib [amd64 arm64 armhf i386 powerpc], gdb, git, bzr
-Restrictions: allow-stderr, isolation-machine, breaks-testbed
+Restrictions: allow-stderr, isolation-machine, breaks-testbed, skippable

debian/tests/ubuntu-regression-suite

 #!/bin/sh
 set -e
 
+# Only run regression-suite on kernels we can boot in canonistack
+source=`dpkg-parsechangelog -SSource`
+case $source in
+    linux|linux-hwe|linux-kvm|linux-oem)
+	;;
+    *)
+	echo "ubuntu-regression-suite is pointless, if one cannot boot the kernel"
+	exit 77
+	;;
+esac
+
 sver=`dpkg-parsechangelog -SVersion`
 read x rver x </proc/version_signature