build-generic: disable cve-check manifest for freeRTOS

With oe-core/65498411d73e8008d5550c2d0a1148f990717587
creating the image manifest for freeRTOS raises an
exception, disable it as it's not relevant

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>

.oniro-ci/build-generic.yaml

@@ -245,6 +245,7 @@
   variables:
     CI_ONIRO_BUILD_FLAVOUR: freertos
     CI_ONIRO_INSTANCE_SIZE: s3.large.2
+    CI_ONIRO_BB_LOCAL_CONF_plus_equals_CVE_CHECK_CREATE_MANIFEST: "0"
   script:
     - !reference [.bitbake-workspace, script]
     - time bitbake freertos-demo