Add OOD_INSTANCE_FLAVOR for OOD instance

.gitlab-ci.yml

@@ -222,7 +222,7 @@ build_ood_image:
         sed -i -E "s/(ood_servername: ).*/\1\"$CI_COMMIT_REF_SLUG.$FLOATING_IP.nip.io\"/" CRI_XCBC/group_vars/knightly
       elif [ $CI_PIPELINE_SOURCE == 'schedule' ]; then
         export PKR_VAR_image_name="ood-${BUILD_DATE}"
-        echo INSTANCE_FLAVOR="cpu16-64g" | tee -a $CI_PROJECT_DIR/image.env
+        echo INSTANCE_FLAVOR="${OOD_INSTANCE_FLAVOR:-cpu16-64g}" | tee -a $CI_PROJECT_DIR/image.env
         echo OOD_INSTANCE_NAME="ood-knightly" | tee -a $CI_PROJECT_DIR/image.env
         echo FLOATING_IP=$TEST_IP | tee -a $CI_PROJECT_DIR/image.env
       fi