format for cloud build variable substituion

build/int.cloudbuild.yaml

@@ -108,14 +108,15 @@ options:
   logging: CLOUD_LOGGING_ONLY
 
 substitutions:
-  #_TEST_PROJECT_ID: "eks-int-${SHORT_SHA}"
   _TEST_PROJECT_ID: "eks-int-eks-int-8523ca0"
   _DEPLOYER_SA: "deployer@${_TEST_PROJECT_ID}.iam.gserviceaccount.com"
   _REGION: "us-central1"
   _DOC_AI_LOCATION: "us"
   _VERTEX_AI_DATA_STORE_REGION: "us"
   _BUILDER_IMAGE_NAME: "us-central1-docker.pkg.dev/${PROJECT_ID}/ci/test-builder"
   _BUILDER_IMAGE_TAG: "1.1.0"
+  #_TEST_PROJECT_ID: "eks-int-${SHORT_SHA}"
+
   # The following subsitutions must be passed by the Cloud Build trigger:
   # _BILLING_ACCOUNT
   # _FOLDER_ID