ci: add testcase for multi-profile UKIs

This tests the whole shebang:

1. That ukify can generate them properly
2. That systemd-boot can dissect them properly
3. That systemd-stub can accept profile selection propery
4. That the profile information ends up in /run/systemd/stub/ properly
5. That systemd-measure correctly calculates the expected PCR 11 values
   for each profile and that we can unlock a public-key bound LUKS
   volume with it

test/meson.build

@@ -376,6 +376,7 @@ foreach dirname : [
         'TEST-83-BTRFS',
         'TEST-84-STORAGETM',
         'TEST-85-NETWORK',
+        'TEST-86-MULTI-PROFILE-UKI',
 ]
         subdir(dirname)
 endforeach