OvmfPkg/PlatformCI: add XenBuild.py

Add build test for OvmfXen.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

OvmfPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml

@@ -142,6 +142,15 @@ jobs:
             # can't boot to uefi shell -> skip test
             Run.Flags: "QEMU_SKIP=TRUE"
             Run: $(should_run)
+
+          OVMF_XEN_X64_DEBUG:
+            Build.File: "$(package)/PlatformCI/XenBuild.py"
+            Build.Arch: "X64"
+            Build.Flags: ""
+            Build.Target: "DEBUG"
+            # this build is for xen not qemu-kvm
+            Run.Flags: "QEMU_SKIP=TRUE"
+            Run: $(should_run)
     workspace:
       clean: all