ci: OPTIONAL -> IS_OPTIONAL (#22)

Signed-off-by: Terry Kong <terryk@nvidia.com>

Author: terrykong

.github/workflows/cicd-main.yml

@@ -169,7 +169,7 @@ jobs:
           - grpo.sh
     with:
       # TODO: For now, allow these to fail since the checks are not robust.
-      OPTIONAL: true
+      IS_OPTIONAL: true
       RUNNER: self-hosted-azure
       TIMEOUT: 8
       SCRIPT: |