CI: Ensure openharmony-builder container is built before use

Signed-off-by: Esben Haabendal <esben.haabendal@huawei.com>

.gitlab-ci.yml

@@ -424,6 +424,9 @@ ohos_fetch:
 ohos:
   stage: test
   needs:
+    - job: openharmony-builder
+      artifacts: false
+      optional: true
     - job: ohos_fetch
       artifacts: true
     - job: build