gitlab-ci: Add Xen cross-build jobs

Cross-build ARM and X86 targets with only Xen accelerator enabled.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20201207131503.3858889-6-philmd@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

.gitlab-ci.d/crossbuilds.yml

@@ -134,3 +134,17 @@ cross-win64-system:
   extends: .cross_system_build_job
   variables:
     IMAGE: fedora-win64-cross
+
+cross-amd64-xen-only:
+  extends: .cross_accel_build_job
+  variables:
+    IMAGE: debian-amd64-cross
+    ACCEL: xen
+    ACCEL_CONFIGURE_OPTS: --disable-tcg --disable-kvm
+
+cross-arm64-xen-only:
+  extends: .cross_accel_build_job
+  variables:
+    IMAGE: debian-arm64-cross
+    ACCEL: xen
+    ACCEL_CONFIGURE_OPTS: --disable-tcg --disable-kvm