.ostc-ci: allow freertos-armv5 to fail

This build is reliably failing to fetch when invoked without download
cache constructed earlier. I've filed an issue to track this
but this blocks the auto-scaling CI system from going to production

Related-To: https://git.ostc-eu.org/OSTC/OHOS/meta-ohos/-/issues/132


Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>

.ostc-ci/machines-and-flavours.yaml

@@ -113,6 +113,8 @@ zephyr-arduino-nano-33-ble:
 
 freertos-armv5:
   extends: .build-freertos
+  # FIXME: https://git.ostc-eu.org/OSTC/OHOS/meta-ohos/-/issues/132
+  allow_failure: true
   variables:
     MACHINE: qemuarmv5
     # See the note on linux-qemu-x86.