sdk-debos-image-building: Increase timeout to 3h

The test currently fails due to timeout.

Signed-off-by: Frédéric Danis <frederic.danis@collabora.com>

test-cases/sdk-debos-image-building.yaml

@@ -46,4 +46,4 @@ run:
     - "# VirtualBox doesn't support nested KVM virtualization, so check that we don't have kvm as well"
     - "# this should trigger the chroot-based Debos backend instead of the fakemachine one"
     - "run-test-in-systemd --user=user --timeout=5min --name ensure-no-kvm test ! -e /dev/kvm"
-    - "run-test-in-systemd --user=user --timeout=120min --name test-sample-documentation test/test-sample-documentation"
+    - "run-test-in-systemd --user=user --timeout=180min --name test-sample-documentation test/test-sample-documentation"