Add bogus gitilies setup for the sdk desugar trigger

Change-Id: I3752d926a129dda05dc5c38cbe00a50aeaa39eab
diff --git a/infra/config/global/luci-scheduler.cfg b/infra/config/global/luci-scheduler.cfg
index 1150d18..aa5d490 100644
--- a/infra/config/global/luci-scheduler.cfg
+++ b/infra/config/global/luci-scheduler.cfg
@@ -45,6 +45,11 @@
 trigger {
   id: "desugar_library_trigger"
   acl_sets: "default"
+  # Apparently we need a gitilies task, this will never trigger.
+  gitiles: {
+    repo: "https://r8.googlesource.com/r8"
+    refs: "regexp:refs/heads/NEVER_EXIST_BUT_MUST_HAVE.*"
+  }
   triggers: "archive_lib_desugar"
 }