OvmfPkg/PlatformCI: dummy grub.efi for AmdSev

Building grub.efi for AmdSev is difficult because it depends on patches
not yet merged to upstream grub.  So shortcut the grub build by simply
creating an empty grub.efi file.  That allows to at least build-test the
AmdSev variant.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Dov Murik <dovmurik@linux.ibm.com>

OvmfPkg/PlatformCI/AmdSevBuild.py

@@ -6,6 +6,7 @@
 ##
 import os
 import sys
+import subprocess
 
 sys.path.append(os.path.dirname(os.path.abspath(__file__)))
 from PlatformBuildLib import SettingsManager
@@ -35,3 +36,7 @@ class CommonPlatform():
 
 import PlatformBuildLib
 PlatformBuildLib.CommonPlatform = CommonPlatform
+
+# hack alert -- create dummy grub.efi
+subprocess.run(['touch', 'OvmfPkg/AmdSev/Grub/grub.efi'])
+subprocess.run(['ls', '-l', '--sort=time', 'OvmfPkg/AmdSev/Grub'])